Emit a compile-time error if a function type parameter is declard with 'final' or 'var'.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index aba2213c581e3c1b60005ae7c3cca65202e2c4c1..114e74f8ba21a20b896d2a82104c006ab48fb0a6 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -4127,6 +4127,14 @@ class SignatureResolver extends CommonResolverVisitor<Element> {
   }
 
   Element visitFunctionExpression(FunctionExpression node) {
+    Modifiers modifiers = currentDefinitions.modifiers;
+    if (modifiers.isFinal()) {
+      compiler.reportError(modifiers,
+          MessageKind.FINAL_FUNCTION_TYPE_PARAMETER);
+    }
+    if (modifiers.isVar()) {
+      compiler.reportError(modifiers, MessageKind.VAR_FUNCTION_TYPE_PARAMETER);
+    }
     // This is a function typed parameter.
     // TODO(ahe): Resolve the function type.
     return visit(node.name);