addressed some PR feedbacks and updating tests

81f03ce0 · Heejae Chang · 5e04eb38 · 81f03ce0 · 81f03ce0 · 81f03ce0
13 changed file
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IArgument.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IArgument.cs
--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IFieldReferenceExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IFieldReferenceExpression.cs
@@ -51,11 +51,8 @@ public void M2(out int i )
 M2(out /*<bind>*/int i/*</bind>*/);
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: i) (OperationKind.Argument) (Syntax: 'int i')
-  IFieldReferenceExpression: System.Int32 Script.i (IsDeclaration: True) (OperationKind.FieldReferenceExpression, Type: System.Int32) (Syntax: 'int i')
+IFieldReferenceExpression: System.Int32 Script.i (IsDeclaration: True) (OperationKind.FieldReferenceExpression, Type: System.Int32) (Syntax: 'int i')
  Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: Script) (Syntax: 'i')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -97,11 +94,8 @@ public void M2(out int i )
 M2(out /*<bind>*/var i/*</bind>*/);
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: i) (OperationKind.Argument) (Syntax: 'var i')
-  IFieldReferenceExpression: System.Int32 Script.i (IsDeclaration: True) (OperationKind.FieldReferenceExpression, Type: System.Int32) (Syntax: 'var i')
+IFieldReferenceExpression: System.Int32 Script.i (IsDeclaration: True) (OperationKind.FieldReferenceExpression, Type: System.Int32) (Syntax: 'var i')
  Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: Script) (Syntax: 'i')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;


--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IForLoopStatement.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IForLoopStatement.cs
@@ -2043,7 +2043,7 @@ private void M()
                      ILocalReferenceExpression: s (OperationKind.LocalReferenceExpression, Type: System.String) (Syntax: 's')
                      InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                      OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-                    IArgument (ArgumentKind.Explicit, Matching Parameter: result) (OperationKind.Argument) (Syntax: 'var i')
+                    IArgument (ArgumentKind.Explicit, Matching Parameter: result) (OperationKind.Argument) (Syntax: 'out var i')
                      ILocalReferenceExpression: i (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i')
                      InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                      OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIfStatement.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIfStatement.cs
@@ -391,7 +391,7 @@ private void M()
            ILocalReferenceExpression: s (OperationKind.LocalReferenceExpression, Type: System.String) (Syntax: 's')
            InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
            OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-          IArgument (ArgumentKind.Explicit, Matching Parameter: result) (OperationKind.Argument) (Syntax: 'var i')
+          IArgument (ArgumentKind.Explicit, Matching Parameter: result) (OperationKind.Argument) (Syntax: 'out var i')
            ILocalReferenceExpression: i (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i')
            InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
            OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -531,7 +531,7 @@ private void A(bool flag)
                          ILocalReferenceExpression: s (OperationKind.LocalReferenceExpression, Type: System.String) (Syntax: 's')
                          InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                          OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-                        IArgument (ArgumentKind.Explicit, Matching Parameter: result) (OperationKind.Argument) (Syntax: 'var i')
+                        IArgument (ArgumentKind.Explicit, Matching Parameter: result) (OperationKind.Argument) (Syntax: 'out var i')
                          ILocalReferenceExpression: i (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i')
                          InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                          OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.cs
@@ -25,11 +25,8 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""""')
  Parts(0)
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -52,13 +49,10 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""Only text part""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""Only text part""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""Only text part""')
  Parts(1):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'Only text part')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""Only text part"") (Syntax: 'Only text part')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -81,15 +75,12 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""{1}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""{1}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""{1}""')
  Parts(1):
      IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -112,16 +103,13 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument, IsInvalid) (Syntax: '$""{}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String, IsInvalid) (Syntax: '$""{}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String, IsInvalid) (Syntax: '$""{}""')
  Parts(1):
      IInterpolation (OperationKind.Interpolation, IsInvalid) (Syntax: '{}')
        Expression: IInvalidExpression (OperationKind.InvalidExpression, Type: null, IsInvalid) (Syntax: '')
            Children(0)
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS1733: Expected expression
@@ -148,8 +136,7 @@ public void M(int x)
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""String {x ... nstant {1}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
  Parts(4):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -163,8 +150,6 @@ public void M(int x)
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -190,8 +175,7 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""String {x ... nstant {1}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
  Parts(6):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -213,8 +197,6 @@ public void M()
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -240,8 +222,7 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""String {x,y:D3}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x,y:D3}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x,y:D3}""')
  Parts(2):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -251,8 +232,6 @@ public void M()
        Alignment: IFieldReferenceExpression: System.Int32 Class.y (Static) (OperationKind.FieldReferenceExpression, Type: System.Int32, Constant: 0) (Syntax: 'y')
            Instance Receiver: null
        FormatString: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""D3"") (Syntax: ':D3')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -279,8 +258,7 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""String {x ... nstant {1}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
  Parts(6):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -306,8 +284,6 @@ public void M()
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -334,8 +310,7 @@ public void M()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""String {M2($""{y}"")}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {M2($""{y}"")}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {M2($""{y}"")}""')
  Parts(2):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -354,8 +329,6 @@ public void M()
                  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -378,8 +351,7 @@ public void M(int x)
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument, IsInvalid) (Syntax: '$""String {x ... nt {Class}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String, IsInvalid) (Syntax: '$""String {x ... nt {Class}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String, IsInvalid) (Syntax: '$""String {x ... nt {Class}""')
  Parts(4):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -396,8 +368,6 @@ public void M(int x)
                IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'Class')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0103: The name 'x1' does not exist in the current context

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILocalReferenceExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILocalReferenceExpression.cs
@@ -30,10 +30,7 @@ public void M2(out int i )
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: i) (OperationKind.Argument) (Syntax: 'var i')
-  ILocalReferenceExpression: i (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
+ILocalReferenceExpression: i (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i')
 ";
            var expectedDiagnostics = DiagnosticDescription.None;


--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.cs
@@ -682,8 +682,7 @@ public void M(string x, int y)
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""String {x ... nstant {1}""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
  Parts(6):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
@@ -703,8 +702,6 @@ public void M(string x, int y)
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;

@@ -921,13 +918,10 @@ static void M(int x, __arglist)
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument) (Syntax: '__arglist(x, y)')
-  IOperation:  (OperationKind.None) (Syntax: '__arglist(x, y)')
+IOperation:  (OperationKind.None) (Syntax: '__arglist(x, y)')
  Children(2):
      IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'x')
      IParameterReferenceExpression: y (OperationKind.ParameterReferenceExpression, Type: System.Boolean) (Syntax: 'y')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = DiagnosticDescription.None;


--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IWhileUntilLoopStatement.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IWhileUntilLoopStatement.cs
@@ -969,7 +969,7 @@ static bool TakeOutParam<T>(T y, out T x)
                          WhenFalse: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
                        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-                      IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: 'var x1')
+                      IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: 'out var x1')
                        ILocalReferenceExpression: x1 (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var x1')
                        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)

--- a/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidExpression.cs
+++ b/src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidExpression.cs
@@ -287,16 +287,13 @@ void F()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument, IsInvalid) (Syntax: 'x + (y * args.Length)')
-  IBinaryOperatorExpression (BinaryOperatorKind.Add) (OperationKind.BinaryOperatorExpression, Type: ?, IsInvalid) (Syntax: 'x + (y * args.Length)')
+IBinaryOperatorExpression (BinaryOperatorKind.Add) (OperationKind.BinaryOperatorExpression, Type: ?, IsInvalid) (Syntax: 'x + (y * args.Length)')
  Left: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program) (Syntax: 'x')
  Right: IBinaryOperatorExpression (BinaryOperatorKind.Multiply) (OperationKind.BinaryOperatorExpression, Type: ?, IsInvalid) (Syntax: 'y * args.Length')
      Left: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: 'y')
          Children(0)
      Right: IPropertyReferenceExpression: System.Int32 System.Array.Length { get; } (OperationKind.PropertyReferenceExpression, Type: System.Int32) (Syntax: 'args.Length')
          Instance Receiver: IParameterReferenceExpression: args (OperationKind.ParameterReferenceExpression, Type: System.String[]) (Syntax: 'args')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0103: The name 'y' does not exist in the current context

--- a/src/Compilers/CSharp/Test/Semantic/Semantics/OperatorTests.cs
+++ b/src/Compilers/CSharp/Test/Semantic/Semantics/OperatorTests.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 System;
 using System.Collections.Generic;
@@ -1133,10 +1133,7 @@ static void Main()
 }
 ";
            string expectedOperationTree = @"
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '(a >> 10) + ... m <= o >= p')
-  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: '(a >> 10) + ... m <= o >= p')
-    Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-    Operand: IBinaryOperatorExpression (BinaryOperatorKind.Or) (OperatorMethod: S S.op_BitwiseOr(S x, S y)) (OperationKind.BinaryOperatorExpression, Type: S) (Syntax: '(a >> 10) + ... m <= o >= p')
+IBinaryOperatorExpression (BinaryOperatorKind.Or) (OperatorMethod: S S.op_BitwiseOr(S x, S y)) (OperationKind.BinaryOperatorExpression, Type: S) (Syntax: '(a >> 10) + ... m <= o >= p')
  Left: IBinaryOperatorExpression (BinaryOperatorKind.And) (OperatorMethod: S S.op_BitwiseAnd(S x, S y)) (OperationKind.BinaryOperatorExpression, Type: S) (Syntax: '(a >> 10) + ... / e % f & g')
      Left: IBinaryOperatorExpression (BinaryOperatorKind.Subtract) (OperatorMethod: S S.op_Subtraction(S x, S y)) (OperationKind.BinaryOperatorExpression, Type: S) (Syntax: '(a >> 10) + ... * d / e % f')
          Left: IBinaryOperatorExpression (BinaryOperatorKind.Add) (OperatorMethod: S S.op_Addition(S x, S y)) (OperationKind.BinaryOperatorExpression, Type: S) (Syntax: '(a >> 10) + (b << 20)')
@@ -1169,8 +1166,6 @@ static void Main()
                      Right: ILocalReferenceExpression: m (OperationKind.LocalReferenceExpression, Type: S) (Syntax: 'm')
                  Right: ILocalReferenceExpression: o (OperationKind.LocalReferenceExpression, Type: S) (Syntax: 'o')
              Right: ILocalReferenceExpression: p (OperationKind.LocalReferenceExpression, Type: S) (Syntax: 'p')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ";
            var expectedDiagnostics = new DiagnosticDescription[] {
                // CS0660: 'S' defines operator == or operator != but does not override Object.Equals(object o)

--- 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
 Imports Microsoft.CodeAnalysis.Test.Utilities
@@ -90,11 +90,11 @@ End Class]]>.Value
 IInvocationExpression ( Sub Program.M2(a As System.Int32, [b As System.Double = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(a:=1, b:=1.0)')
  Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: Program) (Syntax: 'M2')
  Arguments(2):
-      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: '1')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: 'a:=1')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: '1.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=1.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 1) (Syntax: '1.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -122,11 +122,11 @@ End Class]]>.Value
 IInvocationExpression ( Sub Program.M2(a As System.Int32, [b As System.Double = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(b:=1.0, a:=0)')
  Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: Program) (Syntax: 'M2')
  Arguments(2):
-      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: '0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: 'a:=0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: '0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: '1.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=1.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 1) (Syntax: '1.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -158,11 +158,11 @@ IInvocationExpression ( Sub Program.M2([a As System.Int32 = 0], [b As System.Dou
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: 'M2')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: '1.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=1.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 1) (Syntax: '1.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: '2.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: 'c:=2.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 2) (Syntax: '2.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -194,11 +194,11 @@ IInvocationExpression ( Sub Program.M2([a As System.Int32 = 0], [b As System.Dou
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: 'M2')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: '1.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=1.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 1) (Syntax: '1.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: '2.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: 'c:=2.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 2) (Syntax: '2.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -230,7 +230,7 @@ IInvocationExpression ( Sub Program.M2([a As System.Int32 = 0], [b As System.Dou
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: 'M2')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: '2.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=2.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 2) (Syntax: '2.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -270,7 +270,7 @@ IInvocationExpression ( Sub Program.M2([a As System.Int32 = 0], [b As System.Dou
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 0) (Syntax: 'M2')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: '2.0')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: 'c:=2.0')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Double, Constant: 2) (Syntax: '2.0')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -357,11 +357,11 @@ End Class]]>.Value
 IInvocationExpression ( Sub Program.M2([ByRef a As System.Int32 = 0], [ByRef b As System.Double = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'M2(b:=y, a:=x)')
  Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: Program) (Syntax: 'M2')
  Arguments(2):
-      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: 'x')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: a) (OperationKind.Argument) (Syntax: 'a:=x')
        ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'x')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'y')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=y')
        ILocalReferenceExpression: y (OperationKind.LocalReferenceExpression, Type: System.Double) (Syntax: 'y')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
@@ -519,11 +519,11 @@ End Module]]>.Value
 IInvocationExpression ( Sub P.E1([b As System.Int32 = 0], [c As System.Int32 = 0])) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'E1(c:=1, b:=2)')
  Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: P) (Syntax: 'E1')
  Arguments(2):
-      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: '2')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: b) (OperationKind.Argument) (Syntax: 'b:=2')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: '1')
+      IArgument (ArgumentKind.Explicit, Matching Parameter: c) (OperationKind.Argument) (Syntax: 'c:=1')
        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)

--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.vb
@@ -22,11 +22,8 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$""')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""')
  Parts(0)
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -47,13 +44,10 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"Only text part"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"Only text part"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"Only text part"')
  Parts(1):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'Only text part')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "Only text part") (Syntax: 'Only text part')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -74,15 +68,12 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"{1}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"{1}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"{1}"')
  Parts(1):
      IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -134,8 +125,7 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"String {x ... nstant {1}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
  Parts(4):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "String ") (Syntax: 'String ')
@@ -149,8 +139,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -174,8 +162,7 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"String {x ... nstant {1}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
  Parts(6):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "String ") (Syntax: 'String ')
@@ -197,8 +184,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -221,8 +206,7 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"String {x,20:D3}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x,20:D3}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x,20:D3}"')
  Parts(2):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "String ") (Syntax: 'String ')
@@ -231,8 +215,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
            Instance Receiver: IInstanceReferenceExpression (OperationKind.InstanceReferenceExpression, Type: [Class]) (Syntax: 'x')
        Alignment: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 20) (Syntax: '20')
        FormatString: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "D3") (Syntax: ':D3')
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -259,8 +241,7 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"String {x ... nstant {1}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
  Parts(6):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "String ") (Syntax: 'String ')
@@ -286,8 +267,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -314,8 +293,7 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"String {M2($"{y}")}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {M2($"{y}")}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {M2($"{y}")}"')
  Parts(2):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "String ") (Syntax: 'String ')
@@ -334,8 +312,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
                  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty

--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IParameterReferenceExpression.vb
@@ -139,8 +139,7 @@ Class C
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: 'Aggregate y ... nto Count()')
-  IOperation:  (OperationKind.None) (Syntax: 'Aggregate y ... nto Count()')
+IOperation:  (OperationKind.None) (Syntax: 'Aggregate y ... nto Count()')
  Children(1):
      IOperation:  (OperationKind.None) (Syntax: 'Aggregate y ... nto Count()')
        Children(1):
@@ -162,8 +161,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
                                                  Element Values(1):
                                                      IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'x')
                          Arguments(0)
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -190,8 +187,7 @@ Class C
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: 'From y In x ... By y.Length')
-  IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: 'From y In x ... By y.Length')
+IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Object) (Syntax: 'From y In x ... By y.Length')
  Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: True, IsUserDefined: False) (MethodSymbol: null)
  Operand: IOperation:  (OperationKind.None) (Syntax: 'From y In x ... By y.Length')
      Children(1):
@@ -217,8 +213,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
                                          Instance Receiver: IOperation:  (OperationKind.None) (Syntax: 'y')
                              InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
                              OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty
@@ -595,8 +589,7 @@ Friend Class [Class]
 End Class]]>.Value

            Dim expectedOperationTree = <![CDATA[
-IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '$"String {x ... nstant {1}"')
-  IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
+IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$"String {x ... nstant {1}"')
  Parts(6):
      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
        Text: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "String ") (Syntax: 'String ')
@@ -616,8 +609,6 @@ IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argu
        Expression: ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
        Alignment: null
        FormatString: null
-  InConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
-  OutConversion: CommonConversion (Exists: True, IsIdentity: True, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
 ]]>.Value

            Dim expectedDiagnostics = String.Empty