Fix evaluation in frames with _private variable names.

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index 5e4dfd9d575c9aab0549c9309dc7182d2cc99e73..231ea4c61ae4714eaf36c36fa9e9a2d0e5ed3048 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -1028,6 +1028,11 @@ RawObject* ActivationFrame::GetReceiver() {
 }
 
 
+bool IsPrivateVariableName(const String& var_name) {

[rmacnak, 2015/10/07 18:06:21]

Library::IsPrivate already exists and handles more edge cases

+  return (var_name.Length() >= 1) && (var_name.CharAt(0) == '_');
+}
+
+
 RawObject* ActivationFrame::Evaluate(const String& expr) {
   GetDescIndices();
   const GrowableObjectArray& param_names =
@@ -1041,6 +1046,9 @@ RawObject* ActivationFrame::Evaluate(const String& expr) {
     intptr_t ignore;
     VariableAt(i, &name, &ignore, &ignore, &value);
     if (!name.Equals(Symbols::This())) {
+      if (IsPrivateVariableName(name)) {
+        name = String::IdentifierPrettyName(name);
+      }
       param_names.Add(name);
       param_values.Add(value);
     }