Method preVisit

src/ast/ast_allocate_stack.cpp:1014–1020

    class RenameVariables : public Visitor {
    public:
        virtual void preVisit ( ExprVar * var ) override {
            Visitor::preVisit(var);
            auto it = variables.find(var->variable);
            if ( it != variables.end() ) {
                var->name = it->second;
            }
        }
        virtual void preVisit ( ExprLet * let ) override {
            Visitor::preVisit(let);
            for ( auto & v : let->variables ) {