Second try: Fix resolution and canonicalization of typedefs and function types

runtime/lib/mirrors.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "lib/mirrors.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 834 matching lines @@
   } else {
     UNREACHABLE();
   }
 
   Class& klass = Class::Handle();
   Library& library = Library::Handle();
 
   if (decl.IsClass()) {
     klass ^= decl.raw();
     library = klass.library();
-  } else if (decl.IsFunction()) {
+  } else if (decl.IsFunction() && !Function::Cast(decl).IsSignatureFunction()) {
     klass = Function::Cast(decl).origin();
     library = klass.library();
   } else if (decl.IsField()) {
     klass = Field::Cast(decl).Origin();
     library = klass.library();
   } else if (decl.IsLibrary()) {
     library ^= decl.raw();
   } else if (decl.IsTypeParameter()) {
     klass ^= TypeParameter::Cast(decl).parameterized_class();
     library = klass.library();
@@ skipping 1151 matching lines @@
 
 DEFINE_NATIVE_ENTRY(TypeMirror_subtypeTest, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, a, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, b, arguments->NativeArgAt(1));
   return Bool::Get(a.IsSubtypeOf(b, NULL, NULL, Heap::kNew)).raw();
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart