user_rl_capped
capped = user_rl_capped(arg);
bool user_rl_capped(struct expression *expr);
user_rl_capped(expr) ? "[c]" : "",
if (user_rl_capped(expr->left))
if (user_rl_capped(expr->left) || user_rl_capped(expr->right))
user_rl_capped(expr) ? "[c]" : "",
if (user_rl_capped(expr->left) &&
user_rl_capped(expr->right))
return user_rl_capped(expr->unop);
if (user_rl_capped(binop_expr))
if (user_rl_capped(expr->right))