Updated expected tests output for all tests involving IConversionExpressions

08b5bc31 · Fredric Silberberg · 1094d2b0 · 08b5bc31 · 08b5bc31 · 08b5bc31
35 changed file
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests.cs
@@ -48,7 +48,8 @@ static void Test2(int y, params int[] x)
  Instance Receiver: null
  Arguments(1):
      IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: 'null')
-        IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Int32[], Constant: null) (Syntax: 'null')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32[], Constant: null) (Syntax: 'null')
+          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
        InConversion: null
        OutConversion: null");

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IArgument.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IArgument.cs
@@ -239,7 +239,7 @@ static void M1()
    static void M2(int x = 1, int y = 2, int z = 3) { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'M2(9, z: 10);')
  Expression: IInvocationExpression (void P.M2([System.Int32 x = 1], [System.Int32 y = 2], [System.Int32 z = 3])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(9, z: 10)')
      Instance Receiver: null
@@ -508,7 +508,7 @@ public static void E1(this P p, int x = 0, int y = 0)
    { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'this.E1(y: 1, x: 2);')
  Expression: IInvocationExpression (void Extensions.E1(this P p, [System.Int32 x = 0], [System.Int32 y = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'this.E1(y: 1, x: 2)')
      Instance Receiver: null
@@ -762,7 +762,7 @@ void M1()
    void M2(int x = 0, params double[] array) { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M2([System.Int32 x = 0], params System.Double[] array)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(array: 1)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'M2')
  Arguments(2):
@@ -772,7 +772,8 @@ void M1()
              ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: 'M2(array: 1)')
          Initializer: IArrayInitializer (1 elements) (OperationKind.ArrayInitializer) (Syntax: 'M2(array: 1)')
              Element Values(1):
-                  IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Double, Constant: 1) (Syntax: '1')
+                  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Double, Constant: 1) (Syntax: '1')
+                    Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        InConversion: null
        OutConversion: null
@@ -833,7 +834,7 @@ void M1()
    void M2(int x = 0, params double[] array) { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M2([System.Int32 x = 0], params System.Double[] array)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(1, array: 1)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'M2')
  Arguments(2):
@@ -847,7 +848,8 @@ void M1()
              ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: 'M2(1, array: 1)')
          Initializer: IArrayInitializer (1 elements) (OperationKind.ArrayInitializer) (Syntax: 'M2(1, array: 1)')
              Element Values(1):
-                  IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Double, Constant: 1) (Syntax: '1')
+                  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Double, Constant: 1) (Syntax: '1')
+                    Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        InConversion: null
        OutConversion: null
@@ -872,7 +874,7 @@ void M1()
    void M2(int x = 0, params double[] array) { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'M2(array: a, x: 1);')
  Expression: IInvocationExpression ( void P.M2([System.Int32 x = 0], params System.Double[] array)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(array: a, x: 1)')
      Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'M2')
@@ -905,7 +907,7 @@ void M1()
    void M2(int x = 0, params double[] array) { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M2([System.Int32 x = 0], params System.Double[] array)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(array: 1, x: 10)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'M2')
  Arguments(2):
@@ -915,7 +917,8 @@ void M1()
              ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: 'M2(array: 1, x: 10)')
          Initializer: IArrayInitializer (1 elements) (OperationKind.ArrayInitializer) (Syntax: 'M2(array: 1, x: 10)')
              Element Values(1):
-                  IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Double, Constant: 1) (Syntax: '1')
+                  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Double, Constant: 1) (Syntax: '1')
+                    Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        InConversion: null
        OutConversion: null
@@ -1121,7 +1124,7 @@ void M2(int x = 0)
    { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M2([System.Int32 x = 0])) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'M2(1, 2)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P, IsInvalid) (Syntax: 'M2')
  Arguments(2):
@@ -1158,7 +1161,7 @@ void M2(string x )
    { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M2(System.String x)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'M2(1)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'M2')
  Arguments(1):
@@ -1191,7 +1194,7 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression (void System.Console.Write(System.String format, System.Object arg0, System.Object arg1, System.Object arg2, System.Object arg3, __arglist)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.Wri ... arglist(5))')
  Instance Receiver: null
  Arguments(6):
@@ -1200,22 +1203,26 @@ void M()
        InConversion: null
        OutConversion: null
      IArgument (ArgumentKind.Explicit, Matching Parameter: arg0) (OperationKind.Argument) (Syntax: '1')
-        IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '1')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '1')
+          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        InConversion: null
        OutConversion: null
      IArgument (ArgumentKind.Explicit, Matching Parameter: arg1) (OperationKind.Argument) (Syntax: '2')
-        IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '2')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '2')
+          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
        InConversion: null
        OutConversion: null
      IArgument (ArgumentKind.Explicit, Matching Parameter: arg2) (OperationKind.Argument) (Syntax: '3')
-        IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '3')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '3')
+          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (Text: 3) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 3) (Syntax: '3')
        InConversion: null
        OutConversion: null
      IArgument (ArgumentKind.Explicit, Matching Parameter: arg3) (OperationKind.Argument) (Syntax: '4')
-        IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '4')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '4')
+          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (Text: 4) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 4) (Syntax: '4')
        InConversion: null
        OutConversion: null
@@ -1246,7 +1253,7 @@ void M2(int x = ""string"")
    { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M2([System.Int32 x = default(System.Int32)])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2()')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'M2')
  Arguments(1):
@@ -1386,7 +1393,7 @@ void M1()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IPropertyReferenceExpression: System.Int32 P.this[System.Int32 index] { set; } (OperationKind.PropertyReferenceExpression, Type: System.Int32, IsInvalid) (Syntax: 'this[10]')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Explicit) (OperationKind.InstanceReferenceExpression, Type: P, IsInvalid) (Syntax: 'this')
  Arguments(1):
@@ -1395,7 +1402,7 @@ void M1()
        InConversion: null
        OutConversion: null
 ";
-            var expectedDiagnostics = new DiagnosticDescription[] {               
+            var expectedDiagnostics = new DiagnosticDescription[] {
                // file.cs(12,27): error CS0154: The property or indexer 'P.this[int]' cannot be used in this context because it lacks the get accessor
                //         var x = /*<bind>*/this[10]/*</bind>*/;
                Diagnostic(ErrorCode.ERR_PropertyLacksGet, "this[10]").WithArguments("P.this[int]").WithLocation(12, 27)
@@ -1422,7 +1429,7 @@ void M1()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IPropertyReferenceExpression: System.Int32 P.this[System.Int32 index] { get; } (OperationKind.PropertyReferenceExpression, Type: System.Int32, IsInvalid) (Syntax: 'this[10]')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Explicit) (OperationKind.InstanceReferenceExpression, Type: P, IsInvalid) (Syntax: 'this')
  Arguments(1):
@@ -1611,8 +1618,8 @@ .locals init ([0] int32 V_0)
    IL_0021:  ldloc.0
    IL_0022:  ret
  } // end of method P::get_Item
-  
-  .method public hidebysig specialname instance void 
+
+  .method public hidebysig specialname instance void
          set_Item([opt] int32 i,
                   [opt] int32 j,
                   int32 'value') cil managed
@@ -1727,12 +1734,12 @@ .locals init ([0] int32 V_0)
    IL_0021:  ldloc.0
    IL_0022:  ret
  } // end of method P::get_Item
-  
-  .method public hidebysig specialname instance void 
+
+  .method public hidebysig specialname instance void
          set_Item([opt] int32 i,
                   [opt] int32 j,
                   int32 'value') cil managed
-  {    
+  {
    .param [1] = int32(0x00000003)
    .param [2] = int32(0x00000004)
    // Code size       30 (0x1e)
@@ -1844,12 +1851,12 @@ .locals init ([0] int32 V_0)
    IL_0021:  ldloc.0
    IL_0022:  ret
  } // end of method P::get_Item
-  
-  .method public hidebysig specialname instance void 
+
+  .method public hidebysig specialname instance void
          set_Item([opt] int32 i,
                   [opt] int32 j,
                   int32 'value') cil managed
-  { 
+  {
    .param [1] = int32(0x00000003)
    .param [2] = int32(0x00000004)
    // Code size       30 (0x1e)
@@ -1941,7 +1948,7 @@ .maxstack  8
    IL_0000: nop
    IL_0001:  ret
  } // end of method P::M1
-} // end of class P 
+} // end of class P
 ";

            var csharp = @"
@@ -1954,12 +1961,13 @@ public void M2()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void P.M1([System.Int32 s = ""abc""])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'p.M1()')
  Instance Receiver: ILocalReferenceExpression: p (OperationKind.LocalReferenceExpression, Type: P) (Syntax: 'p')
  Arguments(1):
      IArgument (ArgumentKind.DefaultValue, Matching Parameter: s) (OperationKind.Argument) (Syntax: 'p.M1()')
-        IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32) (Syntax: 'p.M1()')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32) (Syntax: 'p.M1()')
+          Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""abc"") (Syntax: 'p.M1()')
        InConversion: null
        OutConversion: null
@@ -1985,13 +1993,13 @@ static void M2(bool? x = null)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression (void P.M2([System.Boolean[missing]? x = null])) (OperationKind.InvocationExpression, Type: System.Void[missing], IsInvalid) (Syntax: 'M2()')
  Instance Receiver: null
  Arguments(0)
 ";

-            var expectedDiagnostics = new DiagnosticDescription[] { 
+            var expectedDiagnostics = new DiagnosticDescription[] {
                // (3,7): error CS0518: Predefined type 'System.Object' is not defined or imported
                // class P
                Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "P").WithArguments("System.Object").WithLocation(2, 7),
@@ -2035,7 +2043,7 @@ static void M2(int x, S s = 0)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression (void P.M2(System.Int32 x, [S s = null])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(1)')
  Instance Receiver: null
  Arguments(1):
@@ -2045,7 +2053,7 @@ static void M2(int x, S s = 0)
        OutConversion: null
 ";

-            var expectedDiagnostics = new DiagnosticDescription[] { 
+            var expectedDiagnostics = new DiagnosticDescription[] {
                      // file.cs(9,27): error CS0246: The type or namespace name 'S' could not be found (are you missing a using directive or an assembly reference?)
                      //     static void M2(int x, S s = 0)
                      Diagnostic(ErrorCode.ERR_SingleTypeNameNotFound, "S").WithArguments("S").WithLocation(9, 27),
@@ -2094,7 +2102,7 @@ class G<T>
        OutConversion: null
 ";

-            var expectedDiagnostics = new DiagnosticDescription[] { 
+            var expectedDiagnostics = new DiagnosticDescription[] {
                      // file.cs(9,29): error CS0246: The type or namespace name 'S' could not be found (are you missing a using directive or an assembly reference?)
                      //     static void M2(int x, G<S> s = null)
                      Diagnostic(ErrorCode.ERR_SingleTypeNameNotFound, "S").WithArguments("S").WithLocation(9, 29)
@@ -2140,7 +2148,7 @@ struct G<T>
        OutConversion: null
 ";

-            var expectedDiagnostics = new DiagnosticDescription[] { 
+            var expectedDiagnostics = new DiagnosticDescription[] {
                      // file.cs(9,29): error CS0246: The type or namespace name 'S' could not be found (are you missing a using directive or an assembly reference?)
                      //     static void M2(int x, G<S> s = null)
                      Diagnostic(ErrorCode.ERR_SingleTypeNameNotFound, "S").WithArguments("S").WithLocation(9, 29)

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IConversionExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IConversionExpression.cs
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIfStatement.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIfStatement.cs
@@ -26,7 +26,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... }')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IBlockStatement (1 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
@@ -65,7 +65,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... }')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IBlockStatement (1 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
@@ -108,7 +108,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (1 == 1) ... }')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.IntegerEquals) (OperationKind.BinaryOperatorExpression, Type: System.Boolean, Constant: True) (Syntax: '1 == 1')
      Left: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
@@ -154,7 +154,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (m > 10) ... }')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.IntegerGreaterThan) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'm > 10')
      Left: ILocalReferenceExpression: m (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'm')
@@ -211,7 +211,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (m > 10) ... }')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.IntegerGreaterThan) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'm > 10')
      Left: ILocalReferenceExpression: m (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'm')
@@ -264,7 +264,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (m >= n  ... }')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.BooleanConditionalAnd) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'm >= n && m >= p')
      Left: IBinaryOperatorExpression (BinaryOperationKind.IntegerGreaterThanOrEqual) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'm >= n')
@@ -316,7 +316,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (n > 20) ... }')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.IntegerGreaterThan) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'n > 20')
      Left: ILocalReferenceExpression: n (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'n')
@@ -374,7 +374,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (int.Try ... , s ={s}"");')
  Condition: IInvocationExpression (System.Boolean System.Int32.TryParse(System.String s, out System.Int32 result)) (OperationKind.InvocationExpression, Type: System.Boolean) (Syntax: 'int.TryPars ...  out var i)')
      Instance Receiver: null
@@ -461,7 +461,7 @@ private int A()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... eLine(A());')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'System.Cons ... eLine(A());')
@@ -504,7 +504,7 @@ private void A(bool flag)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... }')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IBlockStatement (1 statements, 1 locals) (OperationKind.BlockStatement) (Syntax: '{ ... }')
@@ -556,7 +556,7 @@ private static void A(bool flag, int number)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ...  int i, 1);')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IBlockStatement (1 statements, 1 locals) (OperationKind.BlockStatement) (Syntax: 'A(o is int i, 1);')
@@ -601,7 +601,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (obj is  ... }')
  Condition: IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean) (Syntax: 'obj is string str')
      Expression: ILocalReferenceExpression: obj (OperationKind.LocalReferenceExpression, Type: System.Object) (Syntax: 'obj')
@@ -642,7 +642,7 @@ private static void A(object o)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... A(25);')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'A(25);')
@@ -650,7 +650,8 @@ private static void A(object o)
          Instance Receiver: null
          Arguments(1):
              IArgument (ArgumentKind.Explicit, Matching Parameter: o) (OperationKind.Argument) (Syntax: '25')
-                IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '25')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '25')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 25) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 25) (Syntax: '25')
                InConversion: null
                OutConversion: null
@@ -685,7 +686,7 @@ private static void A(bool flag, int number)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... }')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IBlockStatement (1 statements, 1 locals) (OperationKind.BlockStatement) (Syntax: '{ ... }')
@@ -731,7 +732,7 @@ private void M()
 /*</bind>*/    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement, IsInvalid) (Syntax: 'if (obj is  ... else')
  Condition: IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean) (Syntax: 'obj is string str')
      Expression: ILocalReferenceExpression: obj (OperationKind.LocalReferenceExpression, Type: System.Object) (Syntax: 'obj')
@@ -783,9 +784,10 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement, IsInvalid) (Syntax: 'if () ... }')
-  Condition: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: '')
+  Condition: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: '')
+      Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
      Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
          Children(0)
  IfTrue: IBlockStatement (1 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
@@ -829,7 +831,7 @@ private void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement, IsInvalid) (Syntax: 'if (a == 1) ... else')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.IntegerEquals) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'a == 1')
      Left: ILocalReferenceExpression: a (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'a')
@@ -884,7 +886,7 @@ private void B()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (true) ... B();')
  Condition: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Boolean, Constant: True) (Syntax: 'true')
  IfTrue: IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'A();')
@@ -924,7 +926,7 @@ class C
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement) (Syntax: 'if (d.GetTy ... }')
  Condition: IUnaryOperatorExpression (UnaryOperationKind.DynamicTrue) (OperationKind.UnaryOperatorExpression, Type: System.Boolean) (Syntax: 'd.GetType() ... ).Equals(x)')
      Operand: IBinaryOperatorExpression (BinaryOperationKind.DynamicAnd) (OperationKind.BinaryOperatorExpression, Type: dynamic) (Syntax: 'd.GetType() ... ).Equals(x)')
@@ -936,11 +938,13 @@ class C
                            IParameterReferenceExpression: d (OperationKind.ParameterReferenceExpression, Type: dynamic) (Syntax: 'd')
              Right: IParameterReferenceExpression: t (OperationKind.ParameterReferenceExpression, Type: System.Type) (Syntax: 't')
          Right: IInvocationExpression (virtual System.Boolean System.ValueType.Equals(System.Object obj)) (OperationKind.InvocationExpression, Type: System.Boolean) (Syntax: '((T)d).Equals(x)')
-              Instance Receiver: IConversionExpression (ConversionKind.CSharp, Explicit) (OperationKind.ConversionExpression, Type: T) (Syntax: '(T)d')
+              Instance Receiver: IConversionExpression (Explicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: T) (Syntax: '(T)d')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: IParameterReferenceExpression: d (OperationKind.ParameterReferenceExpression, Type: dynamic) (Syntax: 'd')
              Arguments(1):
                  IArgument (ArgumentKind.Explicit, Matching Parameter: obj) (OperationKind.Argument) (Syntax: 'x')
-                    IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: 'x')
+                    IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: 'x')
+                      Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                      Operand: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: T) (Syntax: 'x')
                    InConversion: null
                    OutConversion: null

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIsPatternExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIsPatternExpression.cs
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Test.Utilities;
@@ -123,7 +123,7 @@ void M(X x)
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS8208: It is not legal to use the type 'dynamic' in a pattern.
-                //         if (/*<bind>*/x is dynamic y/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is dynamic y/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_PatternDynamicType, "dynamic").WithLocation(7, 28)
            };

@@ -169,11 +169,12 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean) (Syntax: 'x is (int)12.0')
  Expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Pattern: IConstantPattern (OperationKind.ConstantPattern) (Syntax: '(int)12.0')
-      Value: IConversionExpression (ConversionKind.CSharp, Explicit) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 12) (Syntax: '(int)12.0')
+      Value: IConversionExpression (Explicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 12) (Syntax: '(int)12.0')
+          Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 12) (Syntax: '12.0')
 ";
            var expectedDiagnostics = DiagnosticDescription.None;
@@ -195,16 +196,17 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x is 12.0')
  Expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Pattern: IConstantPattern (OperationKind.ConstantPattern, IsInvalid) (Syntax: '12.0')
-      Value: IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 12, IsInvalid) (Syntax: '12.0')
+      Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 12, IsInvalid) (Syntax: '12.0')
+          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 12, IsInvalid) (Syntax: '12.0')
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0266: Cannot implicitly convert type 'double' to 'int?'. An explicit conversion exists (are you missing a cast?)
-                //         if (/*<bind>*/x is 12.0/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is 12.0/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "12.0").WithArguments("double", "int?").WithLocation(8, 28)
            };

@@ -225,16 +227,17 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x is null')
  Expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'x')
  Pattern: IConstantPattern (OperationKind.ConstantPattern, IsInvalid) (Syntax: 'null')
-      Value: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: 'null')
+      Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: 'null')
+          Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null, IsInvalid) (Syntax: 'null')
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0037: Cannot convert null to 'int' because it is a non-nullable value type
-                //         if (/*<bind>*/x is null/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is null/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_ValueCantBeNull, "null").WithArguments("int").WithLocation(8, 28)
            };

@@ -262,7 +265,7 @@ void M()
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0246: The type or namespace name 'UndefinedType' could not be found (are you missing a using directive or an assembly reference?)
-                //         if (/*<bind>*/x is UndefinedType y/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is UndefinedType y/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_SingleTypeNameNotFound, "UndefinedType").WithArguments("UndefinedType").WithLocation(8, 28)
            };

@@ -291,7 +294,7 @@ void M()
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0150: A constant value is expected
-                //         if (/*<bind>*/x is y/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is y/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_ConstantExpected, "y").WithLocation(8, 28)
            };

@@ -319,7 +322,7 @@ void M()
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS8121: An expression of type 'int?' cannot be handled by a pattern of type 'X'.
-                //         if (/*<bind>*/x is X y/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is X y/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_PatternWrongType, "X").WithArguments("int?", "X").WithLocation(8, 28)
            };

@@ -347,7 +350,7 @@ void M()
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0128: A local variable or function named 'y' is already defined in this scope
-                //         if (/*<bind>*/x is int y/*</bind>*/) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y/*</bind>*/) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_LocalDuplicate, "y").WithArguments("y").WithLocation(8, 32)
            };

@@ -375,25 +378,25 @@ void M()
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS1026: ) expected
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_CloseParenExpected, ",").WithLocation(8, 45),
                // CS1525: Invalid expression term ','
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_InvalidExprTerm, ",").WithArguments(",").WithLocation(8, 45),
                // CS1002: ; expected
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_SemicolonExpected, ",").WithLocation(8, 45),
                // CS1513: } expected
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_RbraceExpected, ",").WithLocation(8, 45),
                // CS1002: ; expected
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_SemicolonExpected, ")").WithLocation(8, 49),
                // CS1513: } expected
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_RbraceExpected, ")").WithLocation(8, 49),
                // CS0103: The name 'y3' does not exist in the current context
-                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is int y2/*</bind>*/, y3) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_NameNotInContext, "y3").WithArguments("y3").WithLocation(8, 47)
            };

@@ -414,38 +417,39 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x is /*</bind>*/')
  Expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'x')
  Pattern: IConstantPattern (OperationKind.ConstantPattern, IsInvalid) (Syntax: '')
-      Value: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+      Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+          Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
              Children(0)
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS1525: Invalid expression term 'const'
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_InvalidExprTerm, "const").WithArguments("const").WithLocation(8, 39),
                // CS1026: ) expected
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_CloseParenExpected, "const").WithLocation(8, 39),
                // CS1023: Embedded statement cannot be a declaration or labeled statement
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_BadEmbeddedStmt, "const int y").WithLocation(8, 39),
                // CS0145: A const field requires a value to be provided
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_ConstValueRequired, "y").WithLocation(8, 49),
                // CS1002: ; expected
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_SemicolonExpected, ")").WithLocation(8, 50),
                // CS1513: } expected
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_RbraceExpected, ")").WithLocation(8, 50),
                // CS0103: The name 'y' does not exist in the current context
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.ERR_NameNotInContext, "y").WithArguments("y").WithLocation(8, 70),
                // CS0168: The variable 'y' is declared but never used
-                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);        
+                //         if (/*<bind>*/x is /*</bind>*/const int y) Console.WriteLine(y);
                Diagnostic(ErrorCode.WRN_UnreferencedVar, "y").WithArguments("y").WithLocation(8, 49)
            };

@@ -464,7 +468,7 @@ void M(string x = /*<bind>*/string.Empty is string y/*</bind>*/)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean, IsInvalid) (Syntax: 'string.Empty is string y')
  Expression: IFieldReferenceExpression: System.String System.String.Empty (Static) (OperationKind.FieldReferenceExpression, Type: System.String, IsInvalid) (Syntax: 'string.Empty')
      Instance Receiver: null
@@ -489,7 +493,7 @@ class C
    private readonly bool b = /*<bind>*/o is int x/*</bind>*/ && x >= 5;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean, IsInvalid) (Syntax: 'o is int x')
  Expression: IFieldReferenceExpression: System.Object C.o (Static) (OperationKind.FieldReferenceExpression, Type: System.Object) (Syntax: 'o')
      Instance Receiver: null
@@ -551,7 +555,7 @@ class C
    private const object o = 1;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIsPatternExpression (OperationKind.IsPatternExpression, Type: System.Boolean, IsInvalid) (Syntax: 'o is int x')
  Expression: IFieldReferenceExpression: System.Object C.o (Static) (OperationKind.FieldReferenceExpression, Type: System.Object, Constant: 1, IsInvalid) (Syntax: 'o')
      Instance Receiver: null
@@ -569,4 +573,4 @@ class C
            VerifyOperationTreeAndDiagnosticsForTest<IsPatternExpressionSyntax>(source, expectedOperationTree, expectedDiagnostics);
        }
    }
-}
\ No newline at end of file
+}
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILambdaExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILambdaExpression.cs
@@ -28,11 +28,12 @@ static void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement) (Syntax: 'Action x /* ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'Action x /* ... *</bind>*/;')
    Variables: Local_1: System.Action x
-    Initializer: IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Action) (Syntax: '() => F()')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Action) (Syntax: '() => F()')
+        Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: ILambdaExpression (Signature: lambda expression) (OperationKind.LambdaExpression, Type: null) (Syntax: '() => F()')
            IBlockStatement (2 statements) (OperationKind.BlockStatement) (Syntax: 'F()')
              IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'F()')
@@ -65,7 +66,7 @@ static void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'var x /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'var x /*<bi ... *</bind>*/;')
    Variables: Local_1: var x
@@ -103,11 +104,12 @@ static void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'Action<int> ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'Action<int> ... *</bind>*/;')
    Variables: Local_1: System.Action<System.Int32> x
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Action<System.Int32>, IsInvalid) (Syntax: '() => F()')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Action<System.Int32>, IsInvalid) (Syntax: '() => F()')
+        Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: ILambdaExpression (Signature: lambda expression) (OperationKind.LambdaExpression, Type: null, IsInvalid) (Syntax: '() => F()')
            IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid) (Syntax: 'F()')
              IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'F()')
@@ -127,7 +129,7 @@ static void F()
        [Fact]
        public void ILambdaExpression_UnboundLambda_ReferenceEquality()
        {
-           string source = @"
+            string source = @"
 using System;

 class Program

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IObjectCreationExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IObjectCreationExpression.cs
@@ -40,7 +40,7 @@ public void M1()
    }/*</bind>*/
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IBlockStatement (7 statements, 7 locals) (OperationKind.BlockStatement, IsInvalid) (Syntax: '{ ... }')
  Locals: Local_1: F x1
    Local_2: F x2
@@ -120,7 +120,8 @@ public void M1()
                  ISimpleAssignmentExpression (OperationKind.SimpleAssignmentExpression, Type: B, IsInvalid) (Syntax: 'Property2 = 1')
                    Left: IPropertyReferenceExpression: B F.Property2 { get; set; } (OperationKind.PropertyReferenceExpression, Type: B) (Syntax: 'Property2')
                        Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: F) (Syntax: 'Property2')
-                    Right: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: B, IsInvalid) (Syntax: '1')
+                    Right: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: B, IsInvalid) (Syntax: '1')
+                        Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                        Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
  IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'var e2 = new F() { """" };')
    IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'var e2 = new F() { """" };')
@@ -161,7 +162,7 @@ public void M1(int x)
 	}
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IObjectCreationExpression (Constructor: System.Collections.Generic.List<System.Int32>..ctor()) (OperationKind.ObjectCreationExpression, Type: System.Collections.Generic.List<System.Int32>) (Syntax: 'new List<in ...  y, field }')
  Arguments(0)
  Initializer: IObjectOrCollectionInitializerExpression (OperationKind.ObjectOrCollectionInitializerExpression, Type: System.Collections.Generic.List<System.Int32>) (Syntax: '{ x, y, field }')
@@ -206,7 +207,7 @@ public void M1(int x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IObjectCreationExpression (Constructor: System.Collections.Generic.List<System.Collections.Generic.List<System.Int32>>..ctor()) (OperationKind.ObjectCreationExpression, Type: System.Collections.Generic.List<System.Collections.Generic.List<System.Int32>>) (Syntax: 'new List<Li ... }')
  Arguments(0)
  Initializer: IObjectOrCollectionInitializerExpression (OperationKind.ObjectOrCollectionInitializerExpression, Type: System.Collections.Generic.List<System.Collections.Generic.List<System.Int32>>) (Syntax: '{ ... }')
@@ -217,7 +218,8 @@ public void M1(int x)
                  Instance Receiver: null
                  Arguments(1):
                      IArgument (ArgumentKind.Explicit, Matching Parameter: source) (OperationKind.Argument) (Syntax: 'new[] { x, y }')
-                        IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Collections.Generic.IEnumerable<System.Int32>) (Syntax: 'new[] { x, y }')
+                        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Collections.Generic.IEnumerable<System.Int32>) (Syntax: 'new[] { x, y }')
+                          Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
                          Operand: IArrayCreationExpression (Element Type: System.Int32) (OperationKind.ArrayCreationExpression, Type: System.Int32[]) (Syntax: 'new[] { x, y }')
                              Dimension Sizes(1):
                                  ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: 'new[] { x, y }')
@@ -270,7 +272,7 @@ public void M(int x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IObjectCreationExpression (Constructor: Class..ctor()) (OperationKind.ObjectCreationExpression, Type: Class) (Syntax: 'new Class() ... }')
  Arguments(0)
  Initializer: IObjectOrCollectionInitializerExpression (OperationKind.ObjectOrCollectionInitializerExpression, Type: Class) (Syntax: '{ ... }')

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.cs
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IPatternSwitchCase.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IPatternSwitchCase.cs
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Test.Utilities;
@@ -27,7 +27,7 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Sections:
@@ -62,7 +62,7 @@ void M()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Sections:
@@ -96,7 +96,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -130,7 +130,7 @@ class X
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -164,7 +164,7 @@ class X
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -204,7 +204,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (2 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -212,7 +212,8 @@ void M(object x)
          Clauses:
              IPatternCaseClause (Label Symbol: case null:) (CaseKind.Pattern) (OperationKind.PatternCaseClause) (Syntax: 'case null:')
                Pattern: IConstantPattern (OperationKind.ConstantPattern) (Syntax: 'case null:')
-                    Value: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                    Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                        Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
                        Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
                Guard Expression: null
          Body:
@@ -248,7 +249,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -256,7 +257,8 @@ void M(object x)
          Clauses:
              IPatternCaseClause (Label Symbol: case null:) (CaseKind.Pattern) (OperationKind.PatternCaseClause) (Syntax: 'case null:')
                Pattern: IConstantPattern (OperationKind.ConstantPattern) (Syntax: 'case null:')
-                    Value: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                    Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                        Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
                        Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
                Guard Expression: null
              IPatternCaseClause (Label Symbol: case X y:) (CaseKind.Pattern) (OperationKind.PatternCaseClause) (Syntax: 'case X y:')
@@ -289,7 +291,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -297,7 +299,8 @@ void M(object x)
          Clauses:
              IPatternCaseClause (Label Symbol: case null:) (CaseKind.Pattern) (OperationKind.PatternCaseClause) (Syntax: 'case null:')
                Pattern: IConstantPattern (OperationKind.ConstantPattern) (Syntax: 'case null:')
-                    Value: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                    Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                        Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
                        Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
                Guard Expression: null
              IPatternCaseClause (Label Symbol: case X y:) (CaseKind.Pattern) (OperationKind.PatternCaseClause) (Syntax: 'case X y:')
@@ -329,7 +332,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -339,7 +342,8 @@ void M(object x)
                Pattern: IDeclarationPattern (Declared Symbol: X y) (OperationKind.DeclarationPattern) (Syntax: 'X y')
                Guard Expression: IBinaryOperatorExpression (BinaryOperationKind.ObjectNotEquals) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'x != null')
                    Left: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
-                    Right: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                    Right: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, Constant: null) (Syntax: 'null')
+                        Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
                        Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
          Body:
              IBranchStatement (BranchKind.Break) (OperationKind.BranchStatement) (Syntax: 'break;')
@@ -366,7 +370,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -402,7 +406,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -410,7 +414,8 @@ void M(object x)
          Clauses:
              IPatternCaseClause (Label Symbol: case X y when :) (CaseKind.Pattern) (OperationKind.PatternCaseClause, IsInvalid) (Syntax: 'case X y when :')
                Pattern: IDeclarationPattern (Declared Symbol: X y) (OperationKind.DeclarationPattern) (Syntax: 'X y')
-                Guard Expression: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: '')
+                Guard Expression: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: '')
+                    Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
                        Children(0)
          Body:
@@ -442,7 +447,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -450,7 +455,8 @@ void M(object x)
          Clauses:
              IPatternCaseClause (Label Symbol: case X y when x:) (CaseKind.Pattern) (OperationKind.PatternCaseClause, IsInvalid) (Syntax: 'case X y when x:')
                Pattern: IDeclarationPattern (Declared Symbol: X y) (OperationKind.DeclarationPattern) (Syntax: 'X y')
-                Guard Expression: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x')
+                Guard Expression: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x')
+                    Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object, IsInvalid) (Syntax: 'x')
          Body:
              IBranchStatement (BranchKind.Break) (OperationKind.BranchStatement) (Syntax: 'break;')
@@ -514,7 +520,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -549,7 +555,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x.G ... }')
  Switch expression: IInvocationExpression ( System.Type System.Object.GetType()) (OperationKind.InvocationExpression, Type: System.Type) (Syntax: 'x.GetType()')
      Instance Receiver: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
@@ -593,7 +599,7 @@ void M(object x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'x')
  Sections:
@@ -631,7 +637,7 @@ void M(int? x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Sections:
@@ -670,7 +676,7 @@ void M(int? x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Sections:
@@ -711,14 +717,15 @@ void M(int? x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x) ... }')
  Switch expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32?) (Syntax: 'x')
  Sections:
      ISwitchCase (1 case clauses, 2 statements) (OperationKind.SwitchCase, IsInvalid) (Syntax: 'case /*</bi ... break;')
          Clauses:
              ISingleValueCaseClause (Equality operator kind: BinaryOperationKind.IntegerEquals) (CaseKind.SingleValue) (OperationKind.SingleValueCaseClause, IsInvalid) (Syntax: 'case /*</bind>*/')
-                Value: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+                Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+                    Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
                        Children(0)
          Body:
@@ -773,7 +780,7 @@ void M(object p)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (3 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (p) ... }')
  Switch expression: IParameterReferenceExpression: p (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'p')
  Sections:

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ISymbolInitializer.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ISymbolInitializer.cs
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
@@ -44,7 +44,7 @@ class C
    static int s1 /*<bind>*/= 1/*</bind>*/;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.s1) (OperationKind.FieldInitializer) (Syntax: '= 1')
  ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
 ";
@@ -66,7 +66,7 @@ class C
    int i1 = 1, i2 /*<bind>*/= 2/*</bind>*/;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.i2) (OperationKind.FieldInitializer) (Syntax: '= 2')
  ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
 ";
@@ -131,9 +131,10 @@ class C
    void M(int p1 = 0, params int[] p2 /*<bind>*/= null/*</bind>*/) { }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IParameterInitializer (Parameter: params System.Int32[] p2) (OperationKind.ParameterInitializer) (Syntax: '= null')
-  IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Int32[], Constant: null) (Syntax: 'null')
+  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32[], Constant: null) (Syntax: 'null')
+    Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
    Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
@@ -156,7 +157,7 @@ class C
    static int F() { return 1; }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.s1) (OperationKind.FieldInitializer) (Syntax: '= 1 + F()')
  IBinaryOperatorExpression (BinaryOperationKind.IntegerAdd) (OperationKind.BinaryOperatorExpression, Type: System.Int32) (Syntax: '1 + F()')
    Left: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
@@ -182,7 +183,7 @@ class C
    static int F() { return 1; }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.s1) (OperationKind.FieldInitializer) (Syntax: '= 1 + F()')
  IBinaryOperatorExpression (BinaryOperationKind.IntegerAdd) (OperationKind.BinaryOperatorExpression, Type: System.Int32) (Syntax: '1 + F()')
    Left: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
@@ -206,7 +207,7 @@ class C
    static int F() { return 1; }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.i1) (OperationKind.FieldInitializer) (Syntax: '= 1 + F()')
  IBinaryOperatorExpression (BinaryOperationKind.IntegerAdd) (OperationKind.BinaryOperatorExpression, Type: System.Int32) (Syntax: '1 + F()')
    Left: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
@@ -235,7 +236,7 @@ partial class C
    int i2 = 2;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.s1) (OperationKind.FieldInitializer) (Syntax: '= 1')
  ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
 ";
@@ -273,7 +274,7 @@ partial class C
    int i2 /*<bind>*/= 2/*</bind>*/;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 C.i2) (OperationKind.FieldInitializer) (Syntax: '= 2')
  ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
 ";
@@ -306,7 +307,7 @@ class C
    static System.Action MakeAction(int x) { return null; }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Action C.e) (OperationKind.FieldInitializer) (Syntax: '= MakeAction(1)')
  IInvocationExpression (System.Action C.MakeAction(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Action) (Syntax: 'MakeAction(1)')
    Instance Receiver: null
@@ -332,7 +333,7 @@ class C
    static System.Action MakeAction(int x) { return null; }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Action C.f) (OperationKind.FieldInitializer) (Syntax: '= MakeAction(2)')
  IInvocationExpression (System.Action C.MakeAction(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Action) (Syntax: 'MakeAction(2)')
    Instance Receiver: null

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ITupleExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ITupleExpression.cs
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IUnaryOperatorExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IUnaryOperatorExpression.cs
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IVariableDeclaration.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IVariableDeclaration.cs
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Test.Utilities;
@@ -23,7 +23,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement) (Syntax: 'int i1;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'int i1;')
    Variables: Local_1: System.Int32 i1
@@ -77,11 +77,12 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'int i1 = ;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'int i1 = ;')
    Variables: Local_1: System.Int32 i1
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+        Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
            Children(0)
 ";
@@ -106,7 +107,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement) (Syntax: 'int i1, i2;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'i1')
    Variables: Local_1: System.Int32 i1
@@ -172,11 +173,12 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'int i1 = ,  ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i1 = ')
    Variables: Local_1: System.Int32 i1
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+        Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
            Children(0)
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'i2 = 2')
@@ -207,7 +209,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'int i,/*</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'i')
    Variables: Local_1: System.Int32 i
@@ -242,7 +244,7 @@ static void Main(string[] args)
    static int GetInt() => 1;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement) (Syntax: 'int i = Get ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'int i = Get ... *</bind>*/;')
    Variables: Local_1: System.Int32 i
@@ -269,7 +271,7 @@ static void Main(string[] args)
    static int GetInt() => 1;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement) (Syntax: 'int i = Get ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'i = GetInt()')
    Variables: Local_1: System.Int32 i
@@ -354,7 +356,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'int[2, 3] a/*</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'int[2, 3] a/*</bind>*/;')
    Variables: Local_1: System.Int32[,] a
@@ -387,7 +389,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'int[2, 3] a ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'a')
    Variables: Local_1: System.Int32[,] a
@@ -1472,11 +1474,12 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
    Variables: Local_1: System.Int32 i1
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+        Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
            Children(0)
 ";
@@ -1501,16 +1504,18 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i1 = ')
    Variables: Local_1: System.Int32 i1
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+        Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
            Children(0)
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i2 = /*</bind>*/')
    Variables: Local_1: System.Int32 i2
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '')
+        Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
            Children(0)
 ";
@@ -1538,7 +1543,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
    Variables: Local_1: System.Int32 i1
@@ -1568,7 +1573,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i1')
    Variables: Local_1: System.Int32 i1
@@ -1607,7 +1612,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i1')
    Variables: Local_1: System.Int32 i1
@@ -1648,7 +1653,7 @@ static void Main(string[] args)
    static int GetInt() => 1;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
    Variables: Local_1: System.Int32 i1
@@ -1679,7 +1684,7 @@ static void Main(string[] args)
    static int GetInt() => 1;
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (2 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'const /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i1 = GetInt()')
    Variables: Local_1: System.Int32 i1

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidExpression.cs
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
@@ -25,7 +25,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( ? ?.()) (OperationKind.InvocationExpression, Type: ?, IsInvalid) (Syntax: 'Console.WriteLine2()')
  Instance Receiver: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: 'Console.WriteLine2')
      Children(1):
@@ -59,7 +59,7 @@ void F(int x)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvocationExpression ( void Program.F(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'F(string.Empty)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Program) (Syntax: 'F')
  Arguments(1):
@@ -128,7 +128,7 @@ void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'var y /*<bi ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'var y /*<bi ... *</bind>*/;')
    Variables: Local_1: ? y
@@ -165,11 +165,12 @@ void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'string y /* ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'string y /* ... *</bind>*/;')
    Variables: Local_1: System.String y
-    Initializer: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.String, IsInvalid) (Syntax: 'x.i1')
+    Initializer: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.String, IsInvalid) (Syntax: 'x.i1')
+        Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IFieldReferenceExpression: System.Int32 Program.i1 (OperationKind.FieldReferenceExpression, Type: System.Int32, IsInvalid) (Syntax: 'x.i1')
            Instance Receiver: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
 ";
@@ -205,11 +206,12 @@ void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclarationStatement, IsInvalid) (Syntax: 'Program y / ... *</bind>*/;')
  IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'Program y / ... *</bind>*/;')
    Variables: Local_1: Program y
-    Initializer: IConversionExpression (ConversionKind.Invalid, Explicit) (OperationKind.ConversionExpression, Type: Program, IsInvalid) (Syntax: '(Program)x.i1')
+    Initializer: IConversionExpression (Explicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: Program, IsInvalid) (Syntax: '(Program)x.i1')
+        Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Operand: IFieldReferenceExpression: System.Int32 Program.i1 (OperationKind.FieldReferenceExpression, Type: System.Int32, IsInvalid) (Syntax: 'x.i1')
            Instance Receiver: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
 ";
@@ -277,7 +279,7 @@ void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IBinaryOperatorExpression (BinaryOperationKind.Invalid) (OperationKind.BinaryOperatorExpression, Type: ?, IsInvalid) (Syntax: 'x + (y * args.Length)')
  Left: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program) (Syntax: 'x')
  Right: IBinaryOperatorExpression (BinaryOperationKind.Invalid) (OperationKind.BinaryOperatorExpression, Type: ?, IsInvalid) (Syntax: 'y * args.Length')
@@ -349,7 +351,7 @@ static void F()
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ILambdaExpression (Signature: lambda expression) (OperationKind.LambdaExpression, Type: null, IsInvalid) (Syntax: '() => F()')
  IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid) (Syntax: 'F()')
    IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'F()')
@@ -379,9 +381,10 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IFieldInitializer (Field: System.Int32 Program.x) (OperationKind.FieldInitializer, IsInvalid) (Syntax: '= Program')
-  IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: 'Program')
+  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: 'Program')
+    Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
    Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: Program, IsInvalid) (Syntax: 'Program')
        Children(1):
            IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'Program')
@@ -410,19 +413,22 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IArrayInitializer (2 elements) (OperationKind.ArrayInitializer, IsInvalid) (Syntax: '{ { { 1, 1  ...  { 2, 2 } }')
  Element Values(2):
      IArrayInitializer (1 elements) (OperationKind.ArrayInitializer, IsInvalid) (Syntax: '{ { 1, 1 } }')
        Element Values(1):
-            IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '{ 1, 1 }')
+            IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, IsInvalid) (Syntax: '{ 1, 1 }')
+              Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
              Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '{ 1, 1 }')
                  Children(1):
                      IArrayInitializer (2 elements) (OperationKind.ArrayInitializer, IsInvalid) (Syntax: '{ 1, 1 }')
                        Element Values(2):
-                            IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, IsInvalid) (Syntax: '1')
+                            IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, IsInvalid) (Syntax: '1')
+                              Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                              Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
-                            IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, IsInvalid) (Syntax: '1')
+                            IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, IsInvalid) (Syntax: '1')
+                              Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                              Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
      IArrayInitializer (2 elements) (OperationKind.ArrayInitializer) (Syntax: '{ 2, 2 }')
        Element Values(2):
@@ -453,7 +459,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IArrayCreationExpression (Element Type: X) (OperationKind.ArrayCreationExpression, Type: X[], IsInvalid) (Syntax: 'new X[Program] { { 1 } }')
  Dimension Sizes(1):
      IInvalidExpression (OperationKind.InvalidExpression, Type: Program, IsInvalid) (Syntax: 'Program')
@@ -461,12 +467,14 @@ static void Main(string[] args)
            IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'Program')
  Initializer: IArrayInitializer (1 elements) (OperationKind.ArrayInitializer, IsInvalid) (Syntax: '{ { 1 } }')
      Element Values(1):
-          IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: X, IsInvalid) (Syntax: '{ 1 }')
+          IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: X, IsInvalid) (Syntax: '{ 1 }')
+            Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
            Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '{ 1 }')
                Children(1):
                    IArrayInitializer (1 elements) (OperationKind.ArrayInitializer, IsInvalid) (Syntax: '{ 1 }')
                      Element Values(1):
-                          IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: System.Object, IsInvalid) (Syntax: '1')
+                          IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object, IsInvalid) (Syntax: '1')
+                            Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                            Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidStatement.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidStatement.cs
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
@@ -103,7 +103,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 ISwitchStatement (1 cases) (OperationKind.SwitchStatement, IsInvalid) (Syntax: 'switch (x.T ... }')
  Switch expression: IInvocationExpression (virtual System.String System.Object.ToString()) (OperationKind.InvocationExpression, Type: System.String) (Syntax: 'x.ToString()')
      Instance Receiver: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program) (Syntax: 'x')
@@ -112,7 +112,8 @@ static void Main(string[] args)
      ISwitchCase (1 case clauses, 1 statements) (OperationKind.SwitchCase, IsInvalid) (Syntax: 'case 1: ... break;')
          Clauses:
              ISingleValueCaseClause (Equality operator kind: BinaryOperationKind.StringEquals) (CaseKind.SingleValue) (OperationKind.SingleValueCaseClause, IsInvalid) (Syntax: 'case 1:')
-                Value: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.String, IsInvalid) (Syntax: '1')
+                Value: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.String, IsInvalid) (Syntax: '1')
+                    Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                    Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
          Body:
              IBranchStatement (BranchKind.Break) (OperationKind.BranchStatement) (Syntax: 'break;')
@@ -143,12 +144,14 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement, IsInvalid) (Syntax: 'if (x = nul ... }')
-  Condition: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x = null')
+  Condition: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x = null')
+      Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
      Operand: ISimpleAssignmentExpression (OperationKind.SimpleAssignmentExpression, Type: Program, IsInvalid) (Syntax: 'x = null')
          Left: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
-          Right: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: Program, Constant: null, IsInvalid) (Syntax: 'null')
+          Right: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: Program, Constant: null, IsInvalid) (Syntax: 'null')
+              Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
              Operand: ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null, IsInvalid) (Syntax: 'null')
  IfTrue: IBlockStatement (0 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
  IfFalse: null
@@ -181,14 +184,16 @@ static void Main(string[] args)
 /*</bind>*/    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IIfStatement (OperationKind.IfStatement, IsInvalid) (Syntax: 'if () ... else')
-  Condition: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: '')
+  Condition: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: '')
+      Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
      Operand: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
          Children(0)
  IfTrue: IBlockStatement (0 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
  IfFalse: IIfStatement (OperationKind.IfStatement, IsInvalid) (Syntax: 'if (x) x; ... else')
-      Condition: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x')
+      Condition: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x')
+          Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
      IfTrue: IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'x;')
          Expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
@@ -234,9 +239,10 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IForLoopStatement (LoopKind.For) (OperationKind.LoopStatement, IsInvalid) (Syntax: 'for (P; x;) ... }')
-  Condition: IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x')
+  Condition: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Boolean, IsInvalid) (Syntax: 'x')
+      Conversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
      Operand: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
  Before:
      IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'P')
@@ -279,7 +285,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvalidStatement (OperationKind.InvalidStatement, IsInvalid) (Syntax: 'goto case 1;')
  Children(1):
      ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
@@ -334,7 +340,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvalidStatement (OperationKind.InvalidStatement, IsInvalid) (Syntax: 'break;')
  Children(0)
 ";
@@ -361,7 +367,7 @@ static void Main(string[] args)
    }
 }
 ";
-string expectedOperationTree = @"
+            string expectedOperationTree = @"
 IInvalidStatement (OperationKind.InvalidStatement, IsInvalid) (Syntax: 'continue;')
  Children(0)
 ";

--- a/src/Compilers/CSharp/Test/Semantic/Semantics/ObjectAndCollectionInitializerTests.cs
+++ b/src/Compilers/CSharp/Test/Semantic/Semantics/ObjectAndCollectionInitializerTests.cs
@@ -194,7 +194,8 @@ public static void Main()
          ISimpleAssignmentExpression (OperationKind.SimpleAssignmentExpression, Type: dynamic) (Syntax: 'X = 0')
            Left: IFieldReferenceExpression: dynamic MemberInitializerTest.X (OperationKind.FieldReferenceExpression, Type: dynamic) (Syntax: 'X')
                Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: MemberInitializerTest) (Syntax: 'X')
-            Right: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: dynamic) (Syntax: '0')
+            Right: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: dynamic) (Syntax: '0')
+                Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                Operand: ILiteralExpression (Text: 0) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: '0')
 ";
            var expectedDiagnostics = DiagnosticDescription.None;
@@ -415,23 +416,28 @@ System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
      Initializers(5):
          ICollectionElementInitializerExpression (AddMethod: void B.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '1')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 1) (Syntax: '1')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 1) (Syntax: '1')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
          ICollectionElementInitializerExpression (AddMethod: void B.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '2')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 2) (Syntax: '2')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 2) (Syntax: '2')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
          ICollectionElementInitializerExpression (AddMethod: void B.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '3')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 3) (Syntax: '3')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 3) (Syntax: '3')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 3) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 3) (Syntax: '3')
          ICollectionElementInitializerExpression (AddMethod: void B.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '4')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 4) (Syntax: '4')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 4) (Syntax: '4')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 4) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 4) (Syntax: '4')
          ICollectionElementInitializerExpression (AddMethod: void B.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '5')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 5) (Syntax: '5')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 5) (Syntax: '5')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 5) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 5) (Syntax: '5')
 ";
            var expectedDiagnostics = DiagnosticDescription.None;
@@ -501,23 +507,28 @@ System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
      Initializers(5):
          ICollectionElementInitializerExpression (AddMethod: void B<System.Int64>.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '1')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 1) (Syntax: '1')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 1) (Syntax: '1')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
          ICollectionElementInitializerExpression (AddMethod: void B<System.Int64>.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '2')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 2) (Syntax: '2')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 2) (Syntax: '2')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
          ICollectionElementInitializerExpression (AddMethod: void B<System.Int64>.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '3')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 3) (Syntax: '3')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 3) (Syntax: '3')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 3) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 3) (Syntax: '3')
          ICollectionElementInitializerExpression (AddMethod: void B<System.Int64>.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '4')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 4) (Syntax: '4')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 4) (Syntax: '4')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 4) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 4) (Syntax: '4')
          ICollectionElementInitializerExpression (AddMethod: void B<System.Int64>.Add(System.Int64 i)) (IsDynamic: False) (OperationKind.CollectionElementInitializerExpression, Type: System.Void) (Syntax: '5')
            Arguments(1):
-                IConversionExpression (ConversionKind.CSharp, Implicit) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 5) (Syntax: '5')
+                IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int64, Constant: 5) (Syntax: '5')
+                  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                  Operand: ILiteralExpression (Text: 5) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 5) (Syntax: '5')
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

--- a/src/Compilers/VisualBasic/Portable/Operations/VisualBasicConversionExpression.vb
+++ b/src/Compilers/VisualBasic/Portable/Operations/VisualBasicConversionExpression.vb
@@ -37,13 +37,17 @@ Namespace Microsoft.CodeAnalysis.VisualBasic

        Private ReadOnly _operandLazy As Lazy(Of IOperation)

-        Public Sub New(operand As Lazy(Of IOperation), conversion As Conversion, isExplicitInCode As Boolean, isTryCast As Boolean, isChecked As Boolean, syntax As SyntaxNode, type As ITypeSymbol, constantValue As [Optional](Of Object))
+        Public Sub New(operandLazy As Lazy(Of IOperation), conversion As Conversion, isExplicitInCode As Boolean, isTryCast As Boolean, isChecked As Boolean, syntax As SyntaxNode, type As ITypeSymbol, constantValue As [Optional](Of Object))
            MyBase.New(conversion, isExplicitInCode, isTryCast, isChecked, syntax, type, constantValue)

-            _operandLazy = operand
+            _operandLazy = operandLazy
        End Sub

-        Public Overrides ReadOnly Property Operand As IOperation = _operandLazy.Value
+        Public Overrides ReadOnly Property Operand As IOperation
+            Get
+                Return _operandLazy.Value
+            End Get
+        End Property
    End Class

    Public Module IConversionExpressionExtensions

--- a/src/Compilers/VisualBasic/Test/Semantic/Binding/BindingObjectInitializerTests.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/Binding/BindingObjectInitializerTests.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb
@@ -16,24 +16,24 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.UnitTests.Semantics
                             <file name="c.vb">
                                 <![CDATA[
 Public Class B2
-    Public Shared Operator +(x As B2, y As B2) As B2 
+    Public Shared Operator +(x As B2, y As B2) As B2
        System.Console.WriteLine("+")
        Return x
    End Operator

-    Public Shared Operator -(x As B2) As B2 
+    Public Shared Operator -(x As B2) As B2
        System.Console.WriteLine("-")
        Return x
    End Operator

-    Public Shared Operator -(x As B2) As B2 
+    Public Shared Operator -(x As B2) As B2
        System.Console.WriteLine("-")
        Return x
    End Operator
 End Class

 Module Module1
-    Sub Main() 
+    Sub Main()
        Dim x, y As New B2()
        x = x + 10
        x = x + y
@@ -142,7 +142,7 @@ IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'x
                             <file name="c.vb">
                                 <![CDATA[
 Public Class B2
-    Public Shared Operator +(x As B2, y As B2) As B2 
+    Public Shared Operator +(x As B2, y As B2) As B2
        System.Console.WriteLine("+")
        Return x
    End Operator
@@ -150,7 +150,7 @@ End Class

 Module Module1
    Sub Main()
-        Dim x, y As Integer 
+        Dim x, y As Integer
        Dim a, b As New B2()
        x += y
        a += b
@@ -230,7 +230,7 @@ Class C
 End Class
 ]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IIfStatement (OperationKind.IfStatement) (Syntax: 'If x <> 0 T ... End If')
  Condition: IBinaryOperatorExpression (BinaryOperationKind.IntegerNotEquals) (OperationKind.BinaryOperatorExpression, Type: System.Boolean) (Syntax: 'x <> 0')
      Left: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'x')
@@ -277,7 +277,8 @@ IForLoopStatement (LoopKind.For) (OperationKind.LoopStatement) (Syntax: 'For i =
      IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'For i = 0 T ... Next')
        Expression: ICompoundAssignmentExpression (BinaryOperationKind.IntegerAdd) (OperationKind.CompoundAssignmentExpression, Type: System.Int32) (Syntax: 'For i = 0 T ... Next')
            Left: ILocalReferenceExpression: i (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'i')
-            Right: IConversionExpression (ConversionKind.Cast, Explicit) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 1) (Syntax: 'For i = 0 T ... Next')
+            Right: IConversionExpression (Explicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 1) (Syntax: 'For i = 0 T ... Next')
+                Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                Operand: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: 'For i = 0 T ... Next')
  Body: IBlockStatement (1 statements) (OperationKind.BlockStatement) (Syntax: 'For i = 0 T ... Next')
      IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'System.Console.Write(i)')
@@ -302,7 +303,7 @@ IForLoopStatement (LoopKind.For) (OperationKind.LoopStatement) (Syntax: 'For i =
                             <file name="c.vb">
                                 <![CDATA[
 Module Module1
-    Sub Main() 
+    Sub Main()
        Test1(Nothing)
        Test2(New System.Guid(), Nothing)
        Test1(AddressOf Main)
@@ -345,7 +346,8 @@ BC30581: 'AddressOf' expression cannot be converted to 'Integer' because 'Intege
  Instance Receiver: null
  Arguments(1):
      IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: 'Nothing')
-        IConversionExpression (ConversionKind.Basic, Implicit) (OperationKind.ConversionExpression, Type: System.Int32(), Constant: null) (Syntax: 'Nothing')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32(), Constant: null) (Syntax: 'Nothing')
+          Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'Nothing')
        InConversion: null
        OutConversion: null")

--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IArgument.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IArgument.vb
-' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 Imports Microsoft.CodeAnalysis.VisualBasic.Syntax

@@ -400,12 +400,13 @@ Class Program
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvocationExpression ( Sub Program.M2([ByRef a As System.Int32 = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(1.0)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Program) (Syntax: 'M2')
  Arguments(1):
      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: '1.0')
-        IConversionExpression (ConversionKind.Basic, Implicit) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 1) (Syntax: '1.0')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32, Constant: 1) (Syntax: '1.0')
+          Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
          Operand: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 1) (Syntax: '1.0')
        InConversion: null
        OutConversion: null
@@ -429,15 +430,17 @@ Class Program
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvocationExpression ( Sub Program.M2([ByRef a As System.Int32 = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(x)')
  Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Program) (Syntax: 'M2')
  Arguments(1):
      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: 'x')
        ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Double) (Syntax: 'x')
-        InConversion: IConversionExpression (ConversionKind.Basic, Implicit) (OperationKind.ConversionExpression, Type: System.Int32) (Syntax: 'x')
+        InConversion: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32) (Syntax: 'x')
+            Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
            Operand: IOperation:  (OperationKind.None) (Syntax: 'x')
-        OutConversion: IConversionExpression (ConversionKind.Basic, Implicit) (OperationKind.ConversionExpression, Type: System.Double) (Syntax: 'x')
+        OutConversion: IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Double) (Syntax: 'x')
+            Conversion: CommonConversion (Exists: False, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
            Operand: IPlaceholderExpression (OperationKind.PlaceholderExpression, Type: System.Int32) (Syntax: 'x')
 ]]>.Value

@@ -641,7 +644,7 @@ Class P
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvalidExpression (OperationKind.InvalidExpression, Type: System.Void, IsInvalid) (Syntax: 'M2()')
  Children(1):
      IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'M2')
@@ -668,7 +671,7 @@ Class P
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvalidExpression (OperationKind.InvalidExpression, Type: System.Void, IsInvalid) (Syntax: 'M2(1, 2)')
  Children(3):
      IOperation:  (OperationKind.None) (Syntax: 'M2')
@@ -697,7 +700,7 @@ Class P
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvalidExpression (OperationKind.InvalidExpression, Type: System.Void, IsInvalid) (Syntax: 'M2(0,,,)')
  Children(5):
      IOperation:  (OperationKind.None) (Syntax: 'M2')
@@ -728,7 +731,7 @@ Class P
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvalidExpression (OperationKind.InvalidExpression, Type: System.Void, IsInvalid) (Syntax: 'M2(0, )')
  Children(3):
      IOperation:  (OperationKind.None) (Syntax: 'M2')
@@ -787,7 +790,7 @@ Class P
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IInvalidExpression (OperationKind.InvalidExpression, Type: System.Void, IsInvalid) (Syntax: 'M2(y:=1)')
  Children(2):
      IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'M2')

--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IConversionExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IConversionExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IFieldReferenceExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IFieldReferenceExpression.vb
-' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

 Imports Microsoft.CodeAnalysis.Semantics
 Imports Microsoft.CodeAnalysis.Test.Utilities
@@ -23,7 +23,7 @@ Class C
    End Sub
 End Class]]>.Value

-Dim expectedOperationTree = <![CDATA[
+            Dim expectedOperationTree = <![CDATA[
 IOperation:  (OperationKind.None) (Syntax: 'Conditional(field)')
  Children(1):
      IFieldReferenceExpression: C.field As System.String (Static) (OperationKind.FieldReferenceExpression, Type: System.String, Constant: "field") (Syntax: 'field')

--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IIfStatement.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IIfStatement.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IObjectCreationExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IObjectCreationExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IResturnStatement.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IResturnStatement.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_ISymbolInitializer.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_ISymbolInitializer.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_ITupleExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_ITupleExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IUnaryOperatorExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IUnaryOperatorExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IVariableDeclaration.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IVariableDeclaration.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_InvalidExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_InvalidExpression.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_InvalidStatement.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_InvalidStatement.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/Semantics/AnonymousTypesTests.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/Semantics/AnonymousTypesTests.vb
--- a/src/Compilers/VisualBasic/Test/Semantic/Semantics/SelectCaseTests.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/Semantics/SelectCaseTests.vb