Allow a method's type parameter to be used in nameof() in parameter d…

…efault value Fixes dotnet#42
gafter · Feb 16, 2015 · 0f3ba43 · 0f3ba43
1 parent 08c5fbf
commit 0f3ba43
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Showing 2 changed files with 14 additions and 1 deletion.
diff --git a/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs b/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs
@@ -846,7 +846,7 @@ private BoundExpression BindDefaultExpression(DefaultExpressionSyntax node, Diag
                 options |= LookupOptions.MustBeInvocableIfMember;
             }
 
-            if (!IsInMethodBody)
+            if (!IsInMethodBody && this.EnclosingNameofArgument == null)
             {
                 Debug.Assert((options & LookupOptions.NamespacesOrTypesOnly) == 0);
                 options |= LookupOptions.MustNotBeMethodTypeParameter;

diff --git a/src/Compilers/CSharp/Test/Semantic/Semantics/NameOfTests.cs b/src/Compilers/CSharp/Test/Semantic/Semantics/NameOfTests.cs
@@ -1155,5 +1155,18 @@ public static void Main()
             var compilation = CreateCompilationWithMscorlib45(source);
             var comp = CompileAndVerify(source, expectedOutput: @"N1N2");
         }
+
+        [Fact, WorkItem(42, "github.com/dotnet/roslyn")]
+        public void NameofTypeParameterInParameterInitializer()
+        {
+            var source =
+@"class Test {
+  void M<T>(
+    T t = default(T), // ok
+    string s = nameof(T) // ok
+  ) { }
+}";
+            var compilation = CreateCompilationWithMscorlib45(source).VerifyDiagnostics();
+        }
     }
 }