Debugging in kernel shaping up.

runtime/vm/kernel.cc

 // Copyright (c) 2016, 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/kernel.h"
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 namespace dart {
 
 namespace kernel {
@@ skipping 1159 matching lines @@
 void TypeParameter::AcceptTreeVisitor(TreeVisitor* visitor) {
   visitor->VisitTypeParameter(this);
 }
 
 
 void TypeParameter::VisitChildren(Visitor* visitor) {
   bound()->AcceptDartTypeVisitor(visitor);
 }
 
 
-Program::~Program() {}
+Program::~Program() {
+  while (valid_token_positions.length() > 0) {
+    delete valid_token_positions.RemoveLast();
+  }
+  while (yield_token_positions.length() > 0) {
+    delete yield_token_positions.RemoveLast();
+  }
+}
 
 
 void Program::AcceptTreeVisitor(TreeVisitor* visitor) {
   visitor->VisitProgram(this);
 }
 
 
 void Program::VisitChildren(Visitor* visitor) {
   VisitList(&libraries(), visitor);
   visitor->VisitProcedureReference(main_method());
 }
 
 
 }  // namespace kernel
 
 }  // namespace dart
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)