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From: "zverok (Victor Shepelev) via ruby-core" <ruby-core@ml.ruby-lang.org>
To: ruby-core@ml.ruby-lang.org
Cc: "zverok (Victor Shepelev)" <noreply@ruby-lang.org>
Subject: [ruby-core:120374] [Ruby master Bug#20965] `it` vs `binding.local_variables`
Date: Mon, 23 Dec 2024 06:19:02 +0000 (UTC)	[thread overview]
Message-ID: <redmine.journal-111151.20241223061902.710@ruby-lang.org> (raw)
In-Reply-To: <redmine.issue-20965.20241218195830.710@ruby-lang.org>

Issue #20965 has been updated by zverok (Victor Shepelev).


Interestingly, numbered block parameters do this:

```ruby
"foo".tap do
  _1
  "bar".tap do
    p binding.local_variables #=> [_1]
    eval("_1") #  undefined local variable or method '_1' for main:Object (NameError)
  end
end
```

I am not saying this is good behavior, though. The things I am concerned about (after the release, of course):
1. Whatever the behavior is, it is deliberate and documented;
2. Whatever the behavior is, it is internally consistent (e.g., in #20955 the thing that surprised me was an inconsistency between proc and lambda);
3. Whatever the behavior is, I’d expect it to be as consistent as possible between `it` and numbered anonymous parameters.

(About the latter one: `it`s behavior, after the change is reverted, actually seems more internally consistent at least between `local_variables` and `eval`, so maybe numbered parameters should follow?)

----------------------------------------
Bug #20965: `it` vs `binding.local_variables`
https://bugs.ruby-lang.org/issues/20965#change-111151

* Author: zverok (Victor Shepelev)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-12-15T13:36:38Z master 366fd9642f) +PRISM [x86_64-linux]
* Backport: 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED
----------------------------------------
`it` is not available in the list of `binding.local_varaibles`, **unlike** numbered parameters:

```ruby
p(proc { binding.local_variables }.call)  # []
p(proc { |x| binding.local_variables }.call)  # [:x]
p(proc { _1; binding.local_variables }.call)  # [:_1]
p(proc { vars = binding.local_variables; _1; vars }.call)  # [:_1, :vars]
p(proc { it; binding.local_variables }.call)  # []
```

I wonder if it is deliberate or accidental.



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  parent reply	other threads:[~2024-12-23  6:19 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-12-18 19:58 [ruby-core:120303] " zverok (Victor Shepelev) via ruby-core
2024-12-19  0:41 ` [ruby-core:120308] " shan (Shannon Skipper) via ruby-core
2024-12-19  6:28 ` [ruby-core:120317] " nobu (Nobuyoshi Nakada) via ruby-core
2024-12-19  9:33 ` [ruby-core:120326] " tompng (tomoya ishida) via ruby-core
2024-12-23  3:37 ` [ruby-core:120369] " mame (Yusuke Endoh) via ruby-core
2024-12-23  4:55 ` [ruby-core:120372] " k0kubun (Takashi Kokubun) via ruby-core
2024-12-23  6:19 ` zverok (Victor Shepelev) via ruby-core [this message]
2024-12-23  8:52 ` [ruby-core:120375] " mame (Yusuke Endoh) via ruby-core
2025-01-09 12:03 ` [ruby-core:120574] " mame (Yusuke Endoh) via ruby-core
2025-01-20  9:47 ` [ruby-core:120744] " mame (Yusuke Endoh) via ruby-core

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