Adjust assert in evaluate for activations.

runtime/vm/debugger.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 "vm/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 999 matching lines @@
   intptr_t num_variables = desc_indices_.length();
   String& var_name = String::Handle();
   Instance& value = Instance::Handle();
   for (intptr_t i = 0; i < num_variables; i++) {
     intptr_t ignore;
     VariableAt(i, &var_name, &ignore, &ignore, &value);
     if (var_name.Equals(Symbols::This())) {
       return value.raw();
     }
   }
-  return Object::null();
+  return Symbols::OptimizedOut().raw();
 }
 
 
 bool IsPrivateVariableName(const String& var_name) {
   return (var_name.Length() >= 1) && (var_name.CharAt(0) == '_');
 }
 
 
 RawObject* ActivationFrame::Evaluate(const String& expr) {
   GetDescIndices();
@@ skipping 16 matching lines @@
     }
   }
 
   if (function().is_static()) {
     const Class& cls = Class::Handle(function().Owner());
     return cls.Evaluate(expr,
                         Array::Handle(Array::MakeArray(param_names)),
                         Array::Handle(Array::MakeArray(param_values)));
   } else {
     const Object& receiver = Object::Handle(GetReceiver());
-    ASSERT(receiver.IsInstance());
-    if (!receiver.IsInstance()) {
+    ASSERT(receiver.IsInstance() || receiver.IsNull());
+    if (!(receiver.IsInstance() || receiver.IsNull())) {

[turnidge, 2015/12/17 19:42:25]

Should you be checkout for <optimized out> here too?

       return Object::null();
     }
     const Instance& inst = Instance::Cast(receiver);
     return inst.Evaluate(expr,
                          Array::Handle(Array::MakeArray(param_names)),
                          Array::Handle(Array::MakeArray(param_values)));
   }
   UNREACHABLE();
   return Object::null();
 }
@@ skipping 2173 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart