Update yield warnings.

pkg/compiler/lib/src/resolution/members.dart

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index 2611192b7ca9cffb378e6c9a833af41840c70e13..3ed5d9724b8dbfb37b38bac57ce565003851d493 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -2470,10 +2470,16 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
     LocalFunctionElementX function = new LocalFunctionElementX(
         name, node, ElementKind.FUNCTION, Modifiers.EMPTY,
         enclosingElement);
-    function.functionSignatureCache =
-        SignatureResolver.analyze(compiler, node.parameters, node.returnType,
-            function, registry, createRealParameters: true);
     ResolverTask.processAsyncMarker(compiler, function);
+    function.functionSignatureCache = SignatureResolver.analyze(
+        compiler,
+        node.parameters,
+        node.returnType,
+        function,
+        registry,
+        createRealParameters: true,
+        asyncMarker:
+            inFunctionDeclaration ? AsyncMarker.SYNC : function.asyncMarker);

[floitsch, 2015/02/04 15:44:57]

What does 'inFunctionDeclaration' do?
Why does it override the function's async-marker?

[Johnni Winther, 2015/02/05 08:48:32]

[inFunctionDeclaration] is `true` if [function] is a location function
declaration and not (anonymous) function expression. Only in the should the
return type be determined using the async marker.

Have refactored to code to put the logic for the later fully in
SignatureResolver.

     checkLocalDefinitionName(node, function);
     registry.defineFunction(node, function);
     if (doAddToScope) {