Method preVisit

src/ast/ast_escape_analysis.cpp:273–277

            return !fun->stub && !fun->isTemplate;
        }
        virtual void preVisit ( Function * fun ) override {
            Visitor::preVisit(fun);
            func = fun;
            pending.clear();
        }
        virtual FunctionPtr visit ( Function * fun ) override {
            func = nullptr;
            return Visitor::visit(fun);