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Date: Tue, 24 Jul 2018 19:48:51 -0600
Message-ID: <CAFMT4NpNaZX3xhZbzXWHMs=AWMbLxmWLS9_xoV5r4fpkQnh24Q@mail.gmail.com>
To: Stas Malyshev <smalyshev@gmail.com>
Cc: Nikita Popov <nikita.ppv@gmail.com>, internals <internals@lists.php.net>
Content-Type: text/plain; charset="UTF-8"
Subject: Re: [PHP-DEV] Implementation ideas for adding early warning for
 mis-use of "parent"?
From: levim@php.net (Levi Morrison)

On Tue, Jul 24, 2018 at 1:15 AM Stanislav Malyshev <smalyshev@gmail.com> wrote:
>
> Hi!
>
> > Please note that for traits and closures it's not possible to determine
> > this at compile time.
>
> Why not for closures? I thought closures are bound at definition site,
> and thus should know everything at compile time?
>
> --
> Stas Malyshev
> smalyshev@gmail.com
>
> --
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php

Closures can be rebound to another scope; see [Closure::bindTo][1]'s
second parameter.

I have a [pull request][2] that adds a compile-time warning for usages
of "parent" without a parent. It need a review; there is a case where
the warning is emitted twice and I don't know what to do.

  [1]: https://secure.php.net/manual/en/closure.bindto.php
  [2]: https://github.com/php/php-src/pull/3404