From 9a09a7075983765f986658294c52d90e71b9f887 Mon Sep 17 00:00:00 2001
From: Heejae Chang <heejaechang@outlook.com>
Date: Fri, 13 Oct 2017 16:51:46 -0700
Subject: [PATCH] remove unnecessary block from bound node for single line
 lambda (#22571)

---
 .../Portable/Binding/Binder_Lambda.vb         |  10 +-
 .../Semantic/IOperation/IOperationTests.vb    | 137 ++++++
 ...rationTests_IDelegateCreationExpression.vb | 423 ++++++++----------
 3 files changed, 337 insertions(+), 233 deletions(-)

diff --git a/src/Compilers/VisualBasic/Portable/Binding/Binder_Lambda.vb b/src/Compilers/VisualBasic/Portable/Binding/Binder_Lambda.vb
index 05719842d7382..8e1ea7292e62a 100644
--- a/src/Compilers/VisualBasic/Portable/Binding/Binder_Lambda.vb
+++ b/src/Compilers/VisualBasic/Portable/Binding/Binder_Lambda.vb
@@ -478,8 +478,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
                     Dim singleLineLambdaSyntax = DirectCast(lambdaSyntax, SingleLineLambdaExpressionSyntax)
                     Dim statement = DirectCast(singleLineLambdaSyntax.Body, StatementSyntax)
 
-                    Dim boundStatement As BoundStatement
-
                     If statement.Kind = SyntaxKind.LocalDeclarationStatement Then
                         ' A local declaration is not allowed in a single line lambda as the top level statement.  Report the error here because it is legal
                         ' to have a single line if which contains a local declaration.  If the error reporting is done in BindStatement then all local 
@@ -487,19 +485,15 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
 
                         ' Bind local declaration, discard diagnostics
                         Dim ignoredDiagnostics = DiagnosticBag.GetInstance()
-                        boundStatement = bodyBinder.BindBlock(lambdaSyntax, singleLineLambdaSyntax.Statements, ignoredDiagnostics).MakeCompilerGenerated()
+                        block = bodyBinder.BindBlock(lambdaSyntax, singleLineLambdaSyntax.Statements, ignoredDiagnostics).MakeCompilerGenerated()
                         ignoredDiagnostics.Free()
 
                         ' Generate a diagnostic and a bad statement node
                         ReportDiagnostic(diagnostics, statement, ERRID.ERR_SubDisallowsStatement)
-                        boundStatement = New BoundBadStatement(statement, ImmutableArray.Create(Of BoundNode)(boundStatement), hasErrors:=True)
                     Else
-                        boundStatement = bodyBinder.BindBlock(lambdaSyntax, singleLineLambdaSyntax.Statements, diagnostics).MakeCompilerGenerated()
+                        block = bodyBinder.BindBlock(lambdaSyntax, singleLineLambdaSyntax.Statements, diagnostics).MakeCompilerGenerated()
                     End If
 
-                    block = New BoundBlock(lambdaSyntax, Nothing, ImmutableArray(Of LocalSymbol).Empty,
-                                           ImmutableArray.Create(boundStatement), boundStatement.HasErrors).MakeCompilerGenerated()
-
                 Case SyntaxKind.MultiLineFunctionLambdaExpression,
                      SyntaxKind.MultiLineSubLambdaExpression
 
diff --git a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb
index 5e677ee8288f4..02e008a5205b0 100644
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb
@@ -701,5 +701,142 @@ ICatchClause (Exception type: System.Exception) (OperationKind.CatchClause) (Syn
 
             VerifyOperationTreeAndDiagnosticsForTest(Of CatchBlockSyntax)(source, expectedOperationTree, expectedDiagnostics)
         End Sub
+
+        <CompilerTrait(CompilerFeature.IOperation)>
+        <Fact()>
+        Public Sub TestSubSingleLineLambda()
+            Dim source = <![CDATA[
+Imports System
+
+Class Test
+    Sub Method()
+        Dim a As Action = Sub() Console.Write("hello")'BIND:"Sub() Console.Write("hello")"
+    End Sub
+End Class]]>.Value
+
+            Dim expectedOperationTree = <![CDATA[
+IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... te("hello")')
+  IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... te("hello")')
+    IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.Write("hello")')
+      Expression: 
+        IInvocationExpression (Sub System.Console.Write(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.Write("hello")')
+          Instance Receiver: 
+            null
+          Arguments(1):
+              IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '"hello"')
+                ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "hello") (Syntax: '"hello"')
+                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)
+    ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... te("hello")')
+      Statement: 
+        null
+    IReturnStatement (OperationKind.ReturnStatement, IsImplicit) (Syntax: 'Sub() Conso ... te("hello")')
+      ReturnedValue: 
+        null
+]]>.Value
+
+            Dim expectedDiagnostics = String.Empty
+
+            VerifyOperationTreeAndDiagnosticsForTest(Of SingleLineLambdaExpressionSyntax)(source, expectedOperationTree, expectedDiagnostics)
+        End Sub
+
+        <CompilerTrait(CompilerFeature.IOperation)>
+        <Fact()>
+        Public Sub TestFunctionSingleLineLambda()
+            Dim source = <![CDATA[
+Imports System
+
+Class Test
+    Sub Method()
+        Dim a As Func(Of Integer) = Function() 1'BIND:"Function() 1"
+    End Sub
+End Class]]>.Value
+
+            Dim expectedOperationTree = <![CDATA[
+IAnonymousFunctionExpression (Symbol: Function () As System.Int32) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Function() 1')
+  IBlockStatement (3 statements, 1 locals) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Function() 1')
+    Locals: Local_1: <anonymous local> As System.Int32
+    IReturnStatement (OperationKind.ReturnStatement, IsImplicit) (Syntax: '1')
+      ReturnedValue: 
+        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+    ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Function() 1')
+      Statement: 
+        null
+    IReturnStatement (OperationKind.ReturnStatement, IsImplicit) (Syntax: 'Function() 1')
+      ReturnedValue: 
+        ILocalReferenceExpression:  (OperationKind.LocalReferenceExpression, Type: System.Int32, IsImplicit) (Syntax: 'Function() 1')
+]]>.Value
+
+            Dim expectedDiagnostics = String.Empty
+
+            VerifyOperationTreeAndDiagnosticsForTest(Of SingleLineLambdaExpressionSyntax)(source, expectedOperationTree, expectedDiagnostics)
+        End Sub
+
+        <CompilerTrait(CompilerFeature.IOperation)>
+        <Fact()>
+        Public Sub TestFunctionMultiLineLambda()
+            Dim source = <![CDATA[
+Imports System
+
+Class Test
+    Sub Method()
+        Dim a As Func(Of Integer) = Function()'BIND:"Function()"
+                                        Return 1
+                                    End Function
+    End Sub
+End Class]]>.Value
+
+            Dim expectedOperationTree = <![CDATA[
+IAnonymousFunctionExpression (Symbol: Function () As System.Int32) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Function()' ... nd Function')
+  IBlockStatement (3 statements, 1 locals) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Function()' ... nd Function')
+    Locals: Local_1: <anonymous local> As System.Int32
+    IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'Return 1')
+      ReturnedValue: 
+        ILiteralExpression (OperationKind.LiteralExpression, Type: System.Int32, Constant: 1) (Syntax: '1')
+    ILabeledStatement (Label: exit) (OperationKind.LabeledStatement) (Syntax: 'End Function')
+      Statement: 
+        null
+    IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'End Function')
+      ReturnedValue: 
+        ILocalReferenceExpression:  (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'End Function')
+]]>.Value
+
+            Dim expectedDiagnostics = String.Empty
+
+            VerifyOperationTreeAndDiagnosticsForTest(Of MultiLineLambdaExpressionSyntax)(source, expectedOperationTree, expectedDiagnostics)
+        End Sub
+
+        <CompilerTrait(CompilerFeature.IOperation)>
+        <Fact()>
+        Public Sub TestSubMultiLineLambda()
+            Dim source = <![CDATA[
+Imports System
+
+Class Test
+    Sub Method()
+        Dim a As Action = Sub()'BIND:"Sub()"
+                              Return
+                          End Sub
+    End Sub
+End Class]]>.Value
+
+            Dim expectedOperationTree = <![CDATA[
+IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub()'BIND: ... End Sub')
+  IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub()'BIND: ... End Sub')
+    IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'Return')
+      ReturnedValue: 
+        null
+    ILabeledStatement (Label: exit) (OperationKind.LabeledStatement) (Syntax: 'End Sub')
+      Statement: 
+        null
+    IReturnStatement (OperationKind.ReturnStatement) (Syntax: 'End Sub')
+      ReturnedValue: 
+        null
+]]>.Value
+
+            Dim expectedDiagnostics = String.Empty
+
+            VerifyOperationTreeAndDiagnosticsForTest(Of MultiLineLambdaExpressionSyntax)(source, expectedOperationTree, expectedDiagnostics)
+        End Sub
     End Class
 End Namespace
diff --git a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IDelegateCreationExpression.vb b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IDelegateCreationExpression.vb
index 3255ec47260b8..ba0b250f55fa8 100644
--- a/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IDelegateCreationExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests_IDelegateCreationExpression.vb
@@ -33,17 +33,16 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
           Target: 
             IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... iteLine("")')
               IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... iteLine("")')
-                IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... iteLine("")')
-                  IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine("")')
-                    Expression: 
-                      IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine("")')
-                        Instance Receiver: 
-                          null
-                        Arguments(1):
-                            IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '""')
-                              ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "") (Syntax: '""')
-                              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)
+                IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine("")')
+                  Expression: 
+                    IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine("")')
+                      Instance Receiver: 
+                        null
+                      Arguments(1):
+                          IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '""')
+                            ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "") (Syntax: '""')
+                            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)
                 ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... iteLine("")')
                   Statement: 
                     null
@@ -72,17 +71,16 @@ End Module]]>.Value
             Dim expectedOperationTree = <![CDATA[
 IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... iteLine("")')
   IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... iteLine("")')
-    IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... iteLine("")')
-      IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine("")')
-        Expression: 
-          IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine("")')
-            Instance Receiver: 
-              null
-            Arguments(1):
-                IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '""')
-                  ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "") (Syntax: '""')
-                  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)
+    IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine("")')
+      Expression: 
+        IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine("")')
+          Instance Receiver: 
+            null
+          Arguments(1):
+              IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: '""')
+                ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "") (Syntax: '""')
+                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)
     ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... iteLine("")')
       Statement: 
         null
@@ -118,17 +116,16 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
           Target: 
             IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... iteLine("")')
               IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... iteLine("")')
-                IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... iteLine("")')
-                  IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                    Expression: 
-                      IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                        Instance Receiver: 
-                          null
-                        Arguments(1):
-                            IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
-                              ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
-                              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)
+                IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
+                  Expression: 
+                    IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
+                      Instance Receiver: 
+                        null
+                      Arguments(1):
+                          IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
+                            ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
+                            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)
                 ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... iteLine("")')
                   Statement: 
                     null
@@ -169,17 +166,16 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
           Target: 
             IAnonymousFunctionExpression (Symbol: Sub (c1 As M1.C1)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(c1 As C ... iteLine("")')
               IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-                IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-                  IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                    Expression: 
-                      IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                        Instance Receiver: 
-                          null
-                        Arguments(1):
-                            IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
-                              ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
-                              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)
+                IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
+                  Expression: 
+                    IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
+                      Instance Receiver: 
+                        null
+                      Arguments(1):
+                          IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
+                            ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
+                            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)
                 ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
                   Statement: 
                     null
@@ -351,17 +347,16 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
           Target: 
             IAnonymousFunctionExpression (Symbol: Sub (o As System.Object)) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub(o As Ob ... riteLine(o)')
               IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub(o As Ob ... riteLine(o)')
-                IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub(o As Ob ... riteLine(o)')
-                  IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine(o)')
-                    Expression: 
-                      IInvocationExpression (Sub System.Console.WriteLine(value As System.Object)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine(o)')
-                        Instance Receiver: 
-                          null
-                        Arguments(1):
-                            IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: 'o')
-                              IParameterReferenceExpression: o (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'o')
-                              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)
+                IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine(o)')
+                  Expression: 
+                    IInvocationExpression (Sub System.Console.WriteLine(value As System.Object)) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine(o)')
+                      Instance Receiver: 
+                        null
+                      Arguments(1):
+                          IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument) (Syntax: 'o')
+                            IParameterReferenceExpression: o (OperationKind.ParameterReferenceExpression, Type: System.Object) (Syntax: 'o')
+                            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)
                 ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub(o As Ob ... riteLine(o)')
                   Statement: 
                     null
@@ -392,13 +387,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -429,13 +423,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
           Statement: 
             null
@@ -472,17 +465,16 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (c1 As M1.C1)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(c1 As C ... iteLine("")')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                Instance Receiver: 
-                  null
-                Arguments(1):
-                    IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
-                      ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
-                      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)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
+              Instance Receiver: 
+                null
+              Arguments(1):
+                  IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
+                    ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
+                    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)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
           Statement: 
             null
@@ -610,13 +602,12 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
               Target: 
                 IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... WriteLine()')
                   IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-                    IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-                      IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-                        Expression: 
-                          IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                            Instance Receiver: 
-                              null
-                            Arguments(0)
+                    IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+                      Expression: 
+                        IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+                          Instance Receiver: 
+                            null
+                          Arguments(0)
                     ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
                       Statement: 
                         null
@@ -688,13 +679,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -801,13 +791,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -840,13 +829,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
           Statement: 
             null
@@ -883,17 +871,16 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (c1 As M1.C1)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(c1 As C ... iteLine("")')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                Instance Receiver: 
-                  null
-                Arguments(1):
-                    IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
-                      ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
-                      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)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
+              Instance Receiver: 
+                null
+              Arguments(1):
+                  IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
+                    ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
+                    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)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
           Statement: 
             null
@@ -1095,13 +1082,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -1134,13 +1120,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -1173,13 +1158,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
           Statement: 
             null
@@ -1216,17 +1200,16 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (c1 As M1.C1)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(c1 As C ... iteLine("")')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                Instance Receiver: 
-                  null
-                Arguments(1):
-                    IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
-                      ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
-                      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)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
+              Instance Receiver: 
+                null
+              Arguments(1):
+                  IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
+                    ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
+                    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)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
           Statement: 
             null
@@ -1263,13 +1246,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -1349,13 +1331,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
           Statement: 
             null
@@ -1392,13 +1373,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -1466,13 +1446,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -1511,13 +1490,12 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
                 Target: 
                   IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub() Conso ... WriteLine()')
                     IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-                      IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-                        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-                          Expression: 
-                            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                              Instance Receiver: 
-                                null
-                              Arguments(0)
+                      IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+                        Expression: 
+                          IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+                            Instance Receiver: 
+                              null
+                            Arguments(0)
                       ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
                         Statement: 
                           null
@@ -1554,13 +1532,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -1627,13 +1604,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (i As System.Int32)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(i As In ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(i As In ... WriteLine()')
           Statement: 
             null
@@ -1670,17 +1646,16 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub (c1 As M1.C1)) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub(c1 As C ... iteLine("")')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
-                Instance Receiver: 
-                  null
-                Arguments(1):
-                    IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
-                      ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
-                      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)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine("")')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine(value As System.String)) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine("")')
+              Instance Receiver: 
+                null
+              Arguments(1):
+                  IArgument (ArgumentKind.Explicit, Matching Parameter: value) (OperationKind.Argument, IsInvalid) (Syntax: '""')
+                    ILiteralExpression (OperationKind.LiteralExpression, Type: System.String, Constant: "", IsInvalid) (Syntax: '""')
+                    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)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub(c1 As C ... iteLine("")')
           Statement: 
             null
@@ -1715,13 +1690,12 @@ IDelegateCreationExpression (OperationKind.DelegateCreationExpression, Type: Sys
   Target: 
     IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null, IsInvalid) (Syntax: 'Sub() Conso ... WriteLine()')
       IBlockStatement (3 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-        IBlockStatement (1 statements) (OperationKind.BlockStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-          IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
-            Expression: 
-              IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
-                Instance Receiver: 
-                  null
-                Arguments(0)
+        IExpressionStatement (OperationKind.ExpressionStatement, IsInvalid) (Syntax: 'Console.WriteLine()')
+          Expression: 
+            IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void, IsInvalid) (Syntax: 'Console.WriteLine()')
+              Instance Receiver: 
+                null
+              Arguments(0)
         ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsInvalid, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
           Statement: 
             null
@@ -3400,13 +3374,12 @@ IVariableDeclarationStatement (1 declarations) (OperationKind.VariableDeclaratio
           Target: 
             IAnonymousFunctionExpression (Symbol: Sub ()) (OperationKind.AnonymousFunctionExpression, Type: null) (Syntax: 'Sub() Conso ... WriteLine()')
               IBlockStatement (3 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-                IBlockStatement (1 statements) (OperationKind.BlockStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
-                  IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
-                    Expression: 
-                      IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
-                        Instance Receiver: 
-                          null
-                        Arguments(0)
+                IExpressionStatement (OperationKind.ExpressionStatement) (Syntax: 'Console.WriteLine()')
+                  Expression: 
+                    IInvocationExpression (Sub System.Console.WriteLine()) (OperationKind.InvocationExpression, Type: System.Void) (Syntax: 'Console.WriteLine()')
+                      Instance Receiver: 
+                        null
+                      Arguments(0)
                 ILabeledStatement (Label: exit) (OperationKind.LabeledStatement, IsImplicit) (Syntax: 'Sub() Conso ... WriteLine()')
                   Statement: 
                     null