Change the IOperation unit test dump format for child nodes (#20716)

* Change the IOperation unit test dump format for child nodes

* fixing the newly merged tests.

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests.cs

@@ -44,17 +44,29 @@ static void Test2(int y, params int[] x)
             var nodes = tree.GetRoot().DescendantNodes().OfType<InvocationExpressionSyntax>().ToArray();
 
             compilation.VerifyOperationTree(nodes[0], expectedOperationTree:
-@"IInvocationExpression (static void Cls.Test1(params System.Int32[] x)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Test1(null)')
-  Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: 'null')
+@"IInvocationExpression (void Cls.Test1(params System.Int32[] x)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Test1(null)')
+  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')
-        ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')");
+          ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
+        InConversion: null
+        OutConversion: null");
 
             compilation.VerifyOperationTree(nodes[1], expectedOperationTree:
-@"IInvocationExpression (static void Cls.Test2(System.Int32 y, params System.Int32[] x)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Test2(new o ... ct(), null)')
-  Arguments(2): IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument, IsInvalid) (Syntax: 'new object()')
+@"IInvocationExpression (void Cls.Test2(System.Int32 y, params System.Int32[] x)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Test2(new o ... ct(), null)')
+  Instance Receiver: null
+  Arguments(2):
+      IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument, IsInvalid) (Syntax: 'new object()')
         IObjectCreationExpression (Constructor: System.Object..ctor()) (OperationKind.ObjectCreationExpression, Type: System.Object, IsInvalid) (Syntax: 'new object()')
+          Arguments(0)
+          Initializer: null
+        InConversion: null
+        OutConversion: null
       IArgument (ArgumentKind.Explicit, Matching Parameter: null) (OperationKind.Argument) (Syntax: 'null')
-      ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')");
+        ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'null')
+        InConversion: null
+        OutConversion: null");
         }
 
         [Fact]

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IFieldReferenceExpression.cs

@@ -27,7 +27,9 @@ void M()
 ";
             string expectedOperationTree = @"
 IOperation:  (OperationKind.None) (Syntax: 'Conditional(field)')
-  Children(1): IFieldReferenceExpression: System.String C.field (Static) (OperationKind.FieldReferenceExpression, Type: System.String, Constant: ""field"") (Syntax: 'field')
+  Children(1):
+      IFieldReferenceExpression: System.String C.field (Static) (OperationKind.FieldReferenceExpression, Type: System.String, Constant: ""field"") (Syntax: 'field')
+        Instance Receiver: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IInterpolatedStringExpression.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;
@@ -23,8 +23,9 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""""')
+  Parts(0)
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -45,9 +46,10 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""Only text part""')
-  Parts(1): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'Only text part')
+  Parts(1):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'Only text part')
         Text: ILiteralExpression (Text: Only text part) (OperationKind.LiteralExpression, Type: System.String, Constant: ""Only text part"") (Syntax: 'Only text part')
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
@@ -69,10 +71,13 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""{1}""')
-  Parts(1): IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
+  Parts(1):
+      IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
         Expression: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -93,10 +98,14 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String, IsInvalid) (Syntax: '$""{}""')
-  Parts(1): IInterpolation (OperationKind.Interpolation, IsInvalid) (Syntax: '{}')
+  Parts(1):
+      IInterpolation (OperationKind.Interpolation, IsInvalid) (Syntax: '{}')
         Expression: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+            Children(0)
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1733: Expected expression
@@ -121,16 +130,21 @@ public void M(int x)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
-  Parts(4): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
+  Parts(4):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
         Text: ILiteralExpression (Text: String ) (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{x}')
         Expression: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'x')
+        Alignment: null
+        FormatString: null
       IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: ' and constant ')
         Text: ILiteralExpression (Text:  and constant ) (OperationKind.LiteralExpression, Type: System.String, Constant: "" and constant "") (Syntax: ' and constant ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
         Expression: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -154,24 +168,29 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
-  Parts(6): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
+  Parts(6):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
         Text: ILiteralExpression (Text: String ) (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{x,20}')
         Expression: IFieldReferenceExpression: System.String Class.x (OperationKind.FieldReferenceExpression, Type: System.String) (Syntax: 'x')
             Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Class) (Syntax: 'x')
         Alignment: ILiteralExpression (Text: 20) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 20) (Syntax: '20')
+        FormatString: null
       IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: ' and ')
         Text: ILiteralExpression (Text:  and ) (OperationKind.LiteralExpression, Type: System.String, Constant: "" and "") (Syntax: ' and ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{y:D3}')
         Expression: IFieldReferenceExpression: System.Int32 Class.y (OperationKind.FieldReferenceExpression, Type: System.Int32) (Syntax: 'y')
             Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Class) (Syntax: 'y')
+        Alignment: null
         FormatString: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""D3"") (Syntax: ':D3')
       IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: ' and constant ')
         Text: ILiteralExpression (Text:  and constant ) (OperationKind.LiteralExpression, Type: System.String, Constant: "" and constant "") (Syntax: ' and constant ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
         Expression: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -195,14 +214,16 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x,y:D3}""')
-  Parts(2): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
+  Parts(2):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
         Text: ILiteralExpression (Text: String ) (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{x,y:D3}')
         Expression: IFieldReferenceExpression: System.String Class.x (OperationKind.FieldReferenceExpression, Type: System.String) (Syntax: 'x')
             Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Class) (Syntax: 'x')
         Alignment: IFieldReferenceExpression: System.Int32 Class.y (Static) (OperationKind.FieldReferenceExpression, Type: System.Int32, Constant: 0) (Syntax: 'y')
+            Instance Receiver: null
         FormatString: ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: ""D3"") (Syntax: ':D3')
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
@@ -228,23 +249,33 @@ public void M()
     private string M2(int z) => z.ToString();
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {x ... nstant {1}""')
-  Parts(6): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
+  Parts(6):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
         Text: ILiteralExpression (Text: String ) (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{x}')
         Expression: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.String) (Syntax: 'x')
+        Alignment: null
+        FormatString: null
       IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: ' and ')
         Text: ILiteralExpression (Text:  and ) (OperationKind.LiteralExpression, Type: System.String, Constant: "" and "") (Syntax: ' and ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{M2(y)}')
         Expression: IInvocationExpression ( System.String Class.M2(System.Int32 z)) (OperationKind.InvocationExpression, Type: System.String) (Syntax: 'M2(y)')
             Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Class) (Syntax: 'M2')
-          Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: z) (OperationKind.Argument) (Syntax: 'y')
+            Arguments(1):
+                IArgument (ArgumentKind.Explicit, Matching Parameter: z) (OperationKind.Argument) (Syntax: 'y')
                   ILocalReferenceExpression: y (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'y')
+                  InConversion: null
+                  OutConversion: null
+        Alignment: null
+        FormatString: null
       IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: ' and constant ')
         Text: ILiteralExpression (Text:  and constant ) (OperationKind.LiteralExpression, Type: System.String, Constant: "" and constant "") (Syntax: ' and constant ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{1}')
         Expression: ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -269,17 +300,26 @@ public void M()
     private int M2(string z) => Int32.Parse(z);
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""String {M2($""{y}"")}""')
-  Parts(2): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
+  Parts(2):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
         Text: ILiteralExpression (Text: String ) (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
       IInterpolation (OperationKind.Interpolation) (Syntax: '{M2($""{y}"")}')
         Expression: IInvocationExpression ( System.Int32 Class.M2(System.String z)) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'M2($""{y}"")')
             Instance Receiver: IInstanceReferenceExpression (InstanceReferenceKind.Implicit) (OperationKind.InstanceReferenceExpression, Type: Class) (Syntax: 'M2')
-          Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: z) (OperationKind.Argument) (Syntax: '$""{y}""')
+            Arguments(1):
+                IArgument (ArgumentKind.Explicit, Matching Parameter: z) (OperationKind.Argument) (Syntax: '$""{y}""')
                   IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String) (Syntax: '$""{y}""')
-                Parts(1): IInterpolation (OperationKind.Interpolation) (Syntax: '{y}')
+                    Parts(1):
+                        IInterpolation (OperationKind.Interpolation) (Syntax: '{y}')
                           Expression: ILocalReferenceExpression: y (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'y')
+                          Alignment: null
+                          FormatString: null
+                  InConversion: null
+                  OutConversion: null
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -300,17 +340,24 @@ public void M(int x)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInterpolatedStringExpression (OperationKind.InterpolatedStringExpression, Type: System.String, IsInvalid) (Syntax: '$""String {x ... nt {Class}""')
-  Parts(4): IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
+  Parts(4):
+      IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: 'String ')
         Text: ILiteralExpression (Text: String ) (OperationKind.LiteralExpression, Type: System.String, Constant: ""String "") (Syntax: 'String ')
       IInterpolation (OperationKind.Interpolation, IsInvalid) (Syntax: '{x1}')
         Expression: IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: 'x1')
+            Children(0)
+        Alignment: null
+        FormatString: null
       IInterpolatedStringText (OperationKind.InterpolatedStringText) (Syntax: ' and constant ')
         Text: ILiteralExpression (Text:  and constant ) (OperationKind.LiteralExpression, Type: System.String, Constant: "" and constant "") (Syntax: ' and constant ')
       IInterpolation (OperationKind.Interpolation, IsInvalid) (Syntax: '{Class}')
         Expression: IInvalidExpression (OperationKind.InvalidExpression, Type: Class, IsInvalid) (Syntax: 'Class')
-          Children(1): IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'Class')
+            Children(1):
+                IOperation:  (OperationKind.None, IsInvalid) (Syntax: 'Class')
+        Alignment: null
+        FormatString: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0103: The name 'x1' does not exist in the current context

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IIsPatternExpression.cs

@@ -414,12 +414,13 @@ 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: '')
           IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+            Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1525: Invalid expression term 'const'
@@ -463,9 +464,10 @@ 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
   Pattern: IDeclarationPattern (Declared Symbol: System.String y) (OperationKind.DeclarationPattern, IsInvalid) (Syntax: 'string y')
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
@@ -487,9 +489,10 @@ 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
   Pattern: IDeclarationPattern (Declared Symbol: System.Int32 x) (OperationKind.DeclarationPattern, IsInvalid) (Syntax: 'int x')
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
@@ -548,9 +551,10 @@ 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
   Pattern: IDeclarationPattern (Declared Symbol: System.Int32 x) (OperationKind.DeclarationPattern, IsInvalid) (Syntax: 'int x')
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILambdaExpression.cs

@@ -26,7 +26,7 @@ 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
@@ -34,8 +34,11 @@ static void F()
         ILambdaExpression (Signature: lambda expression) (OperationKind.LambdaExpression, Type: null) (Syntax: '() => F()')
           IBlockStatement (2 statements) (OperationKind.BlockStatement) (Syntax: 'F()')
             IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'F()')
-              IInvocationExpression (static void Program.F()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'F()')
+              IInvocationExpression (void Program.F()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'F()')
+                Instance Receiver: null
+                Arguments(0)
             IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'F()')
+            null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -60,14 +63,16 @@ 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
     Initializer: 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()')
-            IInvocationExpression (static void Program.F()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'F()')
+            IInvocationExpression (void Program.F()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'F()')
+              Instance Receiver: null
+              Arguments(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0815: Cannot assign lambda expression to an implicitly-typed variable
@@ -96,7 +101,7 @@ 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
@@ -104,7 +109,9 @@ static void F()
         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()')
-              IInvocationExpression (static void Program.F()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'F()')
+              IInvocationExpression (void Program.F()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'F()')
+                Instance Receiver: null
+                Arguments(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1593: Delegate 'Action<int>' does not take 0 arguments

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILocalFunctionStatement.cs

@@ -135,15 +135,19 @@ public void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: System.Int32 Local3(System.Int32 p1)) (OperationKind.LocalFunctionStatement) (Syntax: 'int Local3( ... Local2(p1);')
   IBlockStatement (1 statements) (OperationKind.BlockStatement) (Syntax: '=> x + Local2(p1)')
     IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'x + Local2(p1)')
       IBinaryOperatorExpression (BinaryOperationKind.IntegerAdd) (OperationKind.BinaryOperatorExpression, Type: System.Int32) (Syntax: 'x + Local2(p1)')
         Left: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'x')
-        Right: IInvocationExpression (static System.Int32 Local2(System.Int32 p1)) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'Local2(p1)')
-            Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: p1) (OperationKind.Argument) (Syntax: 'p1')
+        Right: IInvocationExpression (System.Int32 Local2(System.Int32 p1)) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'Local2(p1)')
+            Instance Receiver: null
+            Arguments(1):
+                IArgument (ArgumentKind.Explicit, Matching Parameter: p1) (OperationKind.Argument) (Syntax: 'p1')
                   IParameterReferenceExpression: p1 (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'p1')
+                  InConversion: null
+                  OutConversion: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -162,15 +166,19 @@ public void M(int x)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: System.Int32 Local(System.Int32 p1)) (OperationKind.LocalFunctionStatement) (Syntax: 'int Local(i ... al(x + p1);')
   IBlockStatement (1 statements) (OperationKind.BlockStatement) (Syntax: '=> Local(x + p1)')
     IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'Local(x + p1)')
-      IInvocationExpression (static System.Int32 Local(System.Int32 p1)) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'Local(x + p1)')
-        Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: p1) (OperationKind.Argument) (Syntax: 'x + p1')
+      IInvocationExpression (System.Int32 Local(System.Int32 p1)) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'Local(x + p1)')
+        Instance Receiver: null
+        Arguments(1):
+            IArgument (ArgumentKind.Explicit, Matching Parameter: p1) (OperationKind.Argument) (Syntax: 'x + p1')
               IBinaryOperatorExpression (BinaryOperationKind.IntegerAdd) (OperationKind.BinaryOperatorExpression, Type: System.Int32) (Syntax: 'x + p1')
                 Left: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'x')
                 Right: IParameterReferenceExpression: p1 (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'p1')
+              InConversion: null
+              OutConversion: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -197,14 +205,18 @@ public void M(int x)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: System.Threading.Tasks.Task<System.Int32> LocalAsync(System.Int32 p1)) (OperationKind.LocalFunctionStatement) (Syntax: 'async Task< ... }')
   IBlockStatement (2 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
     IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'await Task.Delay(0);')
       IAwaitExpression (OperationKind.AwaitExpression, Type: System.Void) (Syntax: 'await Task.Delay(0)')
-        IInvocationExpression (static System.Threading.Tasks.Task System.Threading.Tasks.Task.Delay(System.Int32 millisecondsDelay)) (OperationKind.InvocationExpression, Type: System.Threading.Tasks.Task) (Syntax: 'Task.Delay(0)')
-          Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: millisecondsDelay) (OperationKind.Argument) (Syntax: '0')
+        IInvocationExpression (System.Threading.Tasks.Task System.Threading.Tasks.Task.Delay(System.Int32 millisecondsDelay)) (OperationKind.InvocationExpression, Type: System.Threading.Tasks.Task) (Syntax: 'Task.Delay(0)')
+          Instance Receiver: null
+          Arguments(1):
+              IArgument (ArgumentKind.Explicit, Matching Parameter: millisecondsDelay) (OperationKind.Argument) (Syntax: '0')
                 ILiteralExpression (Text: 0) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 0) (Syntax: '0')
+                InConversion: null
+                OutConversion: null
     IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'return x + p1;')
       IBinaryOperatorExpression (BinaryOperationKind.IntegerAdd) (OperationKind.BinaryOperatorExpression, Type: System.Int32) (Syntax: 'x + p1')
         Left: IParameterReferenceExpression: x (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'x')
@@ -256,13 +268,14 @@ void M()
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: void Foo()) (OperationKind.LocalFunctionStatement) (Syntax: 'void Foo() => x++;')
   IBlockStatement (2 statements) (OperationKind.BlockStatement) (Syntax: '=> x++')
     IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'x++')
       IIncrementExpression (UnaryOperandKind.IntegerPostfixIncrement) (OperationKind.IncrementExpression, Type: System.Int32) (Syntax: 'x++')
         Left: ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'x')
     IReturnStatement (OperationKind.ReturnStatement) (Syntax: '=> x++')
+    null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0165: Use of unassigned local variable 'x'
@@ -287,7 +300,7 @@ void M(int p)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: void Foo(out System.Int32 y)) (OperationKind.LocalFunctionStatement) (Syntax: 'void Foo(ou ... ) => y = p;')
   IBlockStatement (2 statements) (OperationKind.BlockStatement) (Syntax: '=> y = p')
     IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'y = p')
@@ -295,6 +308,7 @@ void M(int p)
         Left: IParameterReferenceExpression: y (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'y')
         Right: IParameterReferenceExpression: p (OperationKind.ParameterReferenceExpression, Type: System.Int32) (Syntax: 'p')
     IReturnStatement (OperationKind.ReturnStatement) (Syntax: '=> y = p')
+    null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -313,12 +327,14 @@ void M(int p)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: void Foo(out System.Int32 y)) (OperationKind.LocalFunctionStatement, IsInvalid) (Syntax: 'void Foo(out int y) => ;')
   IBlockStatement (2 statements) (OperationKind.BlockStatement, IsInvalid) (Syntax: '=> ')
     IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: '')
       IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+        Children(0)
     IReturnStatement (OperationKind.ReturnStatement, IsInvalid) (Syntax: '=> ')
+    null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1525: Invalid expression term ';'
@@ -347,10 +363,11 @@ void M(int p)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 ILocalFunctionStatement (Local Function: void Foo()) (OperationKind.LocalFunctionStatement, IsInvalid) (Syntax: 'void Foo( { }')
   IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid) (Syntax: '{ }')
     IReturnStatement (OperationKind.ReturnStatement, IsInvalid) (Syntax: '{ }')
+    null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1026: ) expected

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_IReturnStatement.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.Diagnostics;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
@@ -23,7 +23,9 @@ static void Method()
     }
 }
 ";
-            string expectedOperationTree = @"IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'return;')";
+string expectedOperationTree = @"IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'return;')
+null
+";
             var expectedDiagnostics = DiagnosticDescription.None;
             VerifyOperationTreeAndDiagnosticsForTest<ReturnStatementSyntax>(source, expectedOperationTree, expectedDiagnostics);
         }
@@ -85,7 +87,10 @@ static IEnumerable<int> Method()
     }
 }
 ";
-            string expectedOperationTree = @"IReturnStatement (OperationKind.YieldBreakStatement) (Syntax: 'yield break;')";
+string expectedOperationTree = @"
+IReturnStatement (OperationKind.YieldBreakStatement) (Syntax: 'yield break;')
+null
+";
             var expectedDiagnostics = DiagnosticDescription.None;
 
             VerifyOperationTreeAndDiagnosticsForTest<YieldStatementSyntax>(source, expectedOperationTree, expectedDiagnostics);

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ISymbolInitializer.cs

@@ -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')
 ";
@@ -156,11 +156,13 @@ 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')
-    Right: IInvocationExpression (static System.Int32 C.F()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'F()')
+    Right: IInvocationExpression (System.Int32 C.F()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'F()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -180,11 +182,13 @@ 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')
-    Right: IInvocationExpression (static System.Int32 C.F()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'F()')
+    Right: IInvocationExpression (System.Int32 C.F()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'F()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -202,11 +206,13 @@ 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')
-    Right: IInvocationExpression (static System.Int32 C.F()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'F()')
+    Right: IInvocationExpression (System.Int32 C.F()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'F()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -229,7 +235,7 @@ 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')
 ";
@@ -267,7 +273,7 @@ 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')
 ";
@@ -300,11 +306,15 @@ 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 (static System.Action C.MakeAction(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Action) (Syntax: 'MakeAction(1)')
-    Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: '1')
+  IInvocationExpression (System.Action C.MakeAction(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Action) (Syntax: 'MakeAction(1)')
+    Instance Receiver: null
+    Arguments(1):
+        IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: '1')
           ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+          InConversion: null
+          OutConversion: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -322,11 +332,15 @@ 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 (static System.Action C.MakeAction(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Action) (Syntax: 'MakeAction(2)')
-    Arguments(1): IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: '2')
+  IInvocationExpression (System.Action C.MakeAction(System.Int32 x)) (OperationKind.InvocationExpression, Type: System.Action) (Syntax: 'MakeAction(2)')
+    Instance Receiver: null
+    Arguments(1):
+        IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: '2')
           ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
+          InConversion: null
+          OutConversion: null
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 

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;
@@ -23,10 +23,11 @@ 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
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0168: The variable 'i1' is declared but never used
@@ -76,12 +77,13 @@ 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: '')
         IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+          Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1525: Invalid expression term ';'
@@ -104,12 +106,14 @@ 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
+    Initializer: null
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'i2')
     Variables: Local_1: System.Int32 i2
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0168: The variable 'i1' is declared but never used
@@ -168,12 +172,13 @@ 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: '')
         IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+          Children(0)
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'i2 = 2')
     Variables: Local_1: System.Int32 i2
     Initializer: ILiteralExpression (Text: 2) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 2) (Syntax: '2')
@@ -202,12 +207,14 @@ 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
+    Initializer: null
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: '')
     Variables: Local_1: System.Int32 
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1001: Identifier expected
@@ -235,11 +242,13 @@ 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
-    Initializer: IInvocationExpression (static System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'GetInt()')
+    Initializer: IInvocationExpression (System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'GetInt()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -260,14 +269,18 @@ 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
-    Initializer: IInvocationExpression (static System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'GetInt()')
+    Initializer: IInvocationExpression (System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'GetInt()')
+        Instance Receiver: null
+        Arguments(0)
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'j = GetInt()')
     Variables: Local_1: System.Int32 j
-    Initializer: IInvocationExpression (static System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'GetInt()')
+    Initializer: IInvocationExpression (System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32) (Syntax: 'GetInt()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = DiagnosticDescription.None;
 
@@ -341,10 +354,11 @@ 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
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0270: Array size cannot be specified in a variable declaration (try initializing with a 'new' expression)
@@ -373,12 +387,14 @@ 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
+    Initializer: null
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration) (Syntax: 'b')
     Variables: Local_1: System.Int32[,] b
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0270: Array size cannot be specified in a variable declaration (try initializing with a 'new' expression)
@@ -1456,12 +1472,13 @@ 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: '')
         IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+          Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1525: Invalid expression term ';'
@@ -1484,16 +1501,18 @@ 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: '')
         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: '')
         IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: '')
+          Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1525: Invalid expression term ','
@@ -1519,10 +1538,11 @@ 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: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0145: A const field requires a value to be provided
@@ -1548,12 +1568,14 @@ 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: null
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i2')
     Variables: Local_1: System.Int32 i2
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0145: A const field requires a value to be provided
@@ -1585,12 +1607,14 @@ 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: null
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: '')
     Variables: Local_1: System.Int32 
+    Initializer: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0145: A const field requires a value to be provided
@@ -1624,11 +1648,13 @@ 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
-    Initializer: IInvocationExpression (static System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32, IsInvalid) (Syntax: 'GetInt()')
+    Initializer: IInvocationExpression (System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32, IsInvalid) (Syntax: 'GetInt()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0133: The expression being assigned to 'i1' must be constant
@@ -1653,14 +1679,18 @@ 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
-    Initializer: IInvocationExpression (static System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32, IsInvalid) (Syntax: 'GetInt()')
+    Initializer: IInvocationExpression (System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32, IsInvalid) (Syntax: 'GetInt()')
+        Instance Receiver: null
+        Arguments(0)
   IVariableDeclaration (1 variables) (OperationKind.VariableDeclaration, IsInvalid) (Syntax: 'i2 = GetInt()')
     Variables: Local_1: System.Int32 i2
-    Initializer: IInvocationExpression (static System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32, IsInvalid) (Syntax: 'GetInt()')
+    Initializer: IInvocationExpression (System.Int32 Program.GetInt()) (OperationKind.InvocationExpression, Type: System.Int32, IsInvalid) (Syntax: 'GetInt()')
+        Instance Receiver: null
+        Arguments(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0133: The expression being assigned to 'i1' must be constant

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_InvalidStatement.cs

@@ -103,15 +103,19 @@ 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')
-  Sections: 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:')
+      Arguments(0)
+  Sections:
+      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:')
                 IConversionExpression (ConversionKind.Invalid, Implicit) (OperationKind.ConversionExpression, Type: System.String, IsInvalid) (Syntax: '1')
                   ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
-        Body: IBranchStatement (BranchKind.Break) (OperationKind.BranchStatement) (Syntax: 'break;')
+          Body:
+              IBranchStatement (BranchKind.Break) (OperationKind.BranchStatement) (Syntax: 'break;')
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0029: Cannot implicitly convert type 'int' to 'string'
@@ -139,7 +143,7 @@ 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')
       ISimpleAssignmentExpression (OperationKind.SimpleAssignmentExpression, Type: Program, IsInvalid) (Syntax: 'x = null')
@@ -147,6 +151,7 @@ static void Main(string[] args)
         Right: IConversionExpression (ConversionKind.Cast, Implicit) (OperationKind.ConversionExpression, Type: Program, Constant: null, IsInvalid) (Syntax: 'null')
             ILiteralExpression (Text: null) (OperationKind.LiteralExpression, Type: null, Constant: null, IsInvalid) (Syntax: 'null')
   IfTrue: IBlockStatement (0 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
+  IfFalse: null
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0029: Cannot implicitly convert type 'Program' to 'bool'
@@ -176,10 +181,11 @@ 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: '')
       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')
@@ -188,6 +194,7 @@ static void Main(string[] args)
           ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
       IfFalse: IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: '')
           IInvalidExpression (OperationKind.InvalidExpression, Type: ?) (Syntax: '')
+            Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS1525: Invalid expression term ')'
@@ -227,12 +234,15 @@ 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')
       ILocalReferenceExpression: x (OperationKind.LocalReferenceExpression, Type: Program, IsInvalid) (Syntax: 'x')
-  Before: IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'P')
+  Before:
+      IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'P')
         IInvalidExpression (OperationKind.InvalidExpression, Type: ?, IsInvalid) (Syntax: 'P')
+          Children(0)
+  AtLoopBottom(0)
   Body: IBlockStatement (0 statements) (OperationKind.BlockStatement) (Syntax: '{ ... }')
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
@@ -269,9 +279,10 @@ 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')
+  Children(1):
+      ILiteralExpression (Text: 1) (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1, IsInvalid) (Syntax: '1')
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0159: No such label 'case 1:' within the scope of the goto statement
@@ -323,8 +334,9 @@ static void Main(string[] args)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInvalidStatement (OperationKind.InvalidStatement, IsInvalid) (Syntax: 'break;')
+  Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0139: No enclosing loop out of which to break or continue
@@ -349,8 +361,9 @@ static void Main(string[] args)
     }
 }
 ";
-            string expectedOperationTree = @"
+string expectedOperationTree = @"
 IInvalidStatement (OperationKind.InvalidStatement, IsInvalid) (Syntax: 'continue;')
+  Children(0)
 ";
             var expectedDiagnostics = new DiagnosticDescription[] {
                 // CS0139: No enclosing loop out of which to break or continue

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
@@ -23,9 +23,11 @@ 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')
+  Children(1):
+      IFieldReferenceExpression: C.field As System.String (Static) (OperationKind.FieldReferenceExpression, Type: System.String, Constant: "field") (Syntax: 'field')
+        Instance Receiver: null
 ]]>.Value
 
             Dim expectedDiagnostics = String.Empty