From: "qnighy (Masaki Hara) via ruby-core" <ruby-core@...>
Date: 2025-02-13T07:03:11+00:00
Subject: [ruby-core:120968] [Ruby master Bug#21029] Prism behavior for `defined? (;x)` differs

Issue #21029 has been updated by qnighy (Masaki Hara).


> I think compound expressions (expressions (including empty) concatenated by semicolons) should be ���expression��� as `parse.y`.

Interestingly enough though:

```
% ruby --parser=prism -e "p defined? (x;)"
nil
% ruby --parser=parse.y -e "p defined? (x;)"
nil

% ruby --parser=prism -e "p defined? (;x)"
nil
% ruby --parser=parse.y -e "p defined? (;x)"
"expression"
```

----------------------------------------
Bug #21029: Prism behavior for `defined? (;x)` differs
https://bugs.ruby-lang.org/issues/21029#change-111867

* Author: qnighy (Masaki Hara)
* Status: Assigned
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-01-11T03:21:57Z master 1b3037081e) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Prism has a different behavior for `(;expr)` when used in `defined?` predicate:

```console
% ./miniruby --parser=prism -e "p defined? (;x)"
nil
% ./miniruby --parser=parse.y -e "p defined? (;x)"
"expression"
```

Although not a significant difference, aligning either of them with the other would be better.



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