[ruby-core:122315] [Ruby Bug#21378] variable pinning does not look for method arguments

[ruby-core:122315] [Ruby Bug#21378] variable pinning does not look for method arguments

[shyouhei (Shyouhei Urabe) via ruby-core]

Issue #21378 has been reported by shyouhei (Shyouhei Urabe).

----------------------------------------
Bug #21378: variable pinning does not look for method arguments
https://bugs.ruby-lang.org/issues/21378

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-01-23T15:24:35Z origin/7ed08c4fd31.. 7ed08c4fd3) +PRISM [wasm32-wasi]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Is this intentional?

```
irb(main):001> def x?(y, z) = y in { x: ^z }
<internal:kernel>:168:in 'Kernel#loop': (irb):1: syntax error found (SyntaxError)
> 1 | def x?(y, z) = y in { x: ^z }
    |                           ^ z: no such local variable

        from eval_async:132:in '<main>'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'Kernel.eval'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'block in JS.__eval_async_rb'
        from /bundle/gems/js-2.7.1/lib/js.rb:120:in 'block in JS.__async'
```



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[ruby-core:122316] [Ruby Bug#21378] variable pinning does not look for method arguments

[nobu (Nobuyoshi Nakada) via ruby-core]

Issue #21378 has been updated by nobu (Nobuyoshi Nakada).


It is parsed as `(def x?(y, z) = y) in { x: ^z }`.

----------------------------------------
Bug #21378: variable pinning does not look for method arguments
https://bugs.ruby-lang.org/issues/21378#change-113457

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-01-23T15:24:35Z origin/7ed08c4fd31.. 7ed08c4fd3) +PRISM [wasm32-wasi]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Is this intentional?

```
irb(main):001> def x?(y, z) = y in { x: ^z }
<internal:kernel>:168:in 'Kernel#loop': (irb):1: syntax error found (SyntaxError)
> 1 | def x?(y, z) = y in { x: ^z }
    |                           ^ z: no such local variable

        from eval_async:132:in '<main>'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'Kernel.eval'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'block in JS.__eval_async_rb'
        from /bundle/gems/js-2.7.1/lib/js.rb:120:in 'block in JS.__async'
```



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[ruby-core:122326] [Ruby Bug#21378] variable pinning does not look for method arguments

[Eregon (Benoit Daloze) via ruby-core]

Issue #21378 has been updated by Eregon (Benoit Daloze).

Assignee changed from prism to matz (Yukihiro Matsumoto)

It's the same with parse.y:
```
$ ruby -v --parser=parse.y -e 'def x?(y, z) = y in { x: ^z }'
ruby 3.5.0dev (2025-05-28T04:34:40Z master d064fd067b) [x86_64-linux]
-e:1: z: no such local variable
ruby: compile error (SyntaxError)
```

So I think we should assign matz and not prism.

I guess it's a pitfall of the weird precedence of `def =`, which has already been reported many times in various variants.
`def x?(y, z); y in { x: ^z }; end` works fine of course.

----------------------------------------
Bug #21378: variable pinning does not look for method arguments
https://bugs.ruby-lang.org/issues/21378#change-113474

* Author: shyouhei (Shyouhei Urabe)
* Status: Assigned
* Assignee: matz (Yukihiro Matsumoto)
* ruby -v: ruby 3.5.0dev (2025-01-23T15:24:35Z origin/7ed08c4fd31.. 7ed08c4fd3) +PRISM [wasm32-wasi]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Is this intentional?

```
irb(main):001> def x?(y, z) = y in { x: ^z }
<internal:kernel>:168:in 'Kernel#loop': (irb):1: syntax error found (SyntaxError)
> 1 | def x?(y, z) = y in { x: ^z }
    |                           ^ z: no such local variable

        from eval_async:132:in '<main>'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'Kernel.eval'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'block in JS.__eval_async_rb'
        from /bundle/gems/js-2.7.1/lib/js.rb:120:in 'block in JS.__async'
```



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[ruby-core:122431] [Ruby Bug#21378] variable pinning does not look for method arguments

[mame (Yusuke Endoh) via ruby-core]

Issue #21378 has been updated by mame (Yusuke Endoh).

Status changed from Assigned to Feedback

@yui-knk Do you think this is possible to implement?

----------------------------------------
Bug #21378: variable pinning does not look for method arguments
https://bugs.ruby-lang.org/issues/21378#change-113612

* Author: shyouhei (Shyouhei Urabe)
* Status: Feedback
* Assignee: matz (Yukihiro Matsumoto)
* ruby -v: ruby 3.5.0dev (2025-01-23T15:24:35Z origin/7ed08c4fd31.. 7ed08c4fd3) +PRISM [wasm32-wasi]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Is this intentional?

```
irb(main):001> def x?(y, z) = y in { x: ^z }
<internal:kernel>:168:in 'Kernel#loop': (irb):1: syntax error found (SyntaxError)
> 1 | def x?(y, z) = y in { x: ^z }
    |                           ^ z: no such local variable

        from eval_async:132:in '<main>'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'Kernel.eval'
        from /bundle/gems/js-2.7.1/lib/js.rb:109:in 'block in JS.__eval_async_rb'
        from /bundle/gems/js-2.7.1/lib/js.rb:120:in 'block in JS.__async'
```



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