PositionStack      54 src/parser.cc    explicit PositionStack(bool* ok) : top_(NULL), ok_(ok) {}
PositionStack    3477 src/parser.cc    PositionStack::Element pos(stack, scanner().location().beg_pos);
PositionStack    3496 src/parser.cc    PositionStack stack(ok);
PositionStack      44 src/parser.h   class PositionStack;
PositionStack     634 src/parser.h     Expression* ParseNewPrefix(PositionStack* stack, bool* ok);
PositionStack     635 src/parser.h     Expression* ParseMemberWithNewPrefixesExpression(PositionStack* stack,