Fix expression evaluation in library context

runtime/vm/debugger_api_impl.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 "include/dart_debugger_api.h"
 
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 489 matching lines @@
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
 
   const Object& target = Object::Handle(isolate, Api::UnwrapHandle(target_in));
   if (target.IsError()) return target_in;
   if (target.IsNull()) {
     return Api::NewError("%s expects argument 'target' to be non-null",
                          CURRENT_FUNC);
   }
   UNWRAP_AND_CHECK_PARAM(String, expr, expr_in);
+  // Type extends Instance, must check first.
   if (target.IsType()) {
     const Class& cls = Class::Handle(isolate, Type::Cast(target).type_class());
     return Api::NewHandle(isolate, cls.Evaluate(expr));
   } else if (target.IsInstance()) {
     return Api::NewHandle(isolate, Instance::Cast(target).Evaluate(expr));
   } else if (target.IsLibrary()) {
     return Api::NewHandle(isolate, Library::Cast(target).Evaluate(expr));
+  } else if (target.IsClass()) {
+    return Api::NewHandle(isolate, Class::Cast(target).Evaluate(expr));
   }
   return Api::NewError("%s: unsupported target type", CURRENT_FUNC);
 }
 
 
 DART_EXPORT Dart_Handle Dart_GetObjClass(Dart_Handle object_in) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   UNWRAP_AND_CHECK_PARAM(Instance, obj, object_in);
   return Api::NewHandle(isolate, obj.GetType());
@@ skipping 356 matching lines @@
 
 
 DART_EXPORT char* Dart_GetVmStatus(const char* request) {
   if (strncmp(request, "/isolate/", 9) == 0) {
     return Isolate::GetStatus(request);
   }
   return NULL;
 }
 
 }  // namespace dart