Exceptions thrown during yield operation fall through the generator instead of being handled within

Description

The following code:

<?php

set_error_handler(function() { throw new \Error(); });

function &gen() {
    try {
        yield 1;
    } catch (Error $e) {
        print "Caught";
    }
}

foreach (gen() as $y);

Resulted in Uncaught Error

But I expected this output instead:

Caught

return_by_ref has the same problem, it seems to me, however in generators there's the additional case of exceptions in destructors of previous key and values.

I wouldn't change the longstanding behaviour in current PHP versions, but should be fixed for PHP 8.2 possibly, for academical correctness at least.

PHP Version

master

Operating System

No response

在 PHP master 上复现提供的 generator 示例，并将观察到的错误流与预期的 catch 行为进行比较。然后检查 generator 的 yield 处理、按引用返回的行为以及所提到的 destructor 情况。对于报告的场景，预期的异常处理已得到定义并覆盖，且未无意中更改既有行为，即视为完成。