Added tests for out vars and deconstruction assignments.

src/Compilers/CSharp/Test/Semantic/IOperation/IOperationTests_ILocalReferenceExpression.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.
+
+
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.CodeAnalysis.CSharp.UnitTests
+{
+    public partial class IOperationTests : SemanticModelTestBase
+    {
+        [CompilerTrait(CompilerFeature.IOperation)]
+        [Fact]
+        public void ILocalReferenceExpression_OutVar()
+        {
+            string source = @"
+using System;
+
+public class C1
+{
+    public virtual void M1()
+    {
+        M2(out /*<bind>*/var i/*</bind>*/);
+    }
+
+    public void M2(out int i )
+    {
+        i = 0;
+    }
+}
+";
+            string expectedOperationTree = @"
+ILocalReferenceExpression: i (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i')
+";
+            var expectedDiagnostics = DiagnosticDescription.None;
+
+            VerifyOperationTreeAndDiagnosticsForTest<DeclarationExpressionSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+
+        [CompilerTrait(CompilerFeature.IOperation)]
+        [Fact]
+        public void ILocalReferenceExpression_DeconstructionDeclaration()
+        {
+            string source = @"
+using System;
+
+public class C1
+{
+    public virtual void M1()
+    {
+        /*<bind>*/(var i1, var i2)/*</bind>*/ = (1, 2);
+    }
+}
+";
+            string expectedOperationTree = @"
+ITupleExpression (OperationKind.TupleExpression, Type: (System.Int32 i1, System.Int32 i2)) (Syntax: '(var i1, var i2)')
+  Elements(2):
+      ILocalReferenceExpression: i1 (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i1')
+      ILocalReferenceExpression: i2 (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'var i2')
+";
+            var expectedDiagnostics = DiagnosticDescription.None;
+
+            VerifyOperationTreeAndDiagnosticsForTest<TupleExpressionSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+
+        [CompilerTrait(CompilerFeature.IOperation)]
+        [Fact]
+        public void ILocalReferenceExpression_DeconstructionDeclaration_AlternateSyntax()
+        {
+            string source = @"
+using System;
+
+public class C1
+{
+    public virtual void M1()
+    {
+        /*<bind>*/var (i1, i2)/*</bind>*/ = (1, 2);
+    }
+}
+";
+            string expectedOperationTree = @"
+ITupleExpression (OperationKind.TupleExpression, Type: (System.Int32 i1, System.Int32 i2)) (Syntax: 'var (i1, i2)')
+  Elements(2):
+      ILocalReferenceExpression: i1 (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'i1')
+      ILocalReferenceExpression: i2 (IsDeclaration: True) (OperationKind.LocalReferenceExpression, Type: System.Int32) (Syntax: 'i2')
+";
+            var expectedDiagnostics = DiagnosticDescription.None;
+
+            VerifyOperationTreeAndDiagnosticsForTest<DeclarationExpressionSyntax>(source, expectedOperationTree, expectedDiagnostics);
+        }
+
+
+    }
+}