push_expression
push_expression(&big_expression_stack, expr);
push_expression(&big_condition_stack, expr);
push_expression(&big_expression_stack, expr);
push_expression(&big_expression_stack, expr);
push_expression(&big_expression_stack, right);
void push_expression(struct expression_list **estack, struct expression *expr);
push_expression(&switch_expr_stack, stmt->switch_expression);
push_expression(&big_expression_stack, expr);
push_expression(&post_op_stack, expr);
push_expression(&switch_expr_stack, stmt->switch_expression);