[ruby-core:122877] [Ruby Bug#21139] Prism and parse.y parses `it = it` differently
From:
"AMomchilov (Alexander Momchilov) via ruby-core" <ruby-core@...>
Date:
2025-07-28 18:43:05 UTC
List:
ruby-core #122877
Issue #21139 has been updated by AMomchilov (Alexander Momchilov).
@jeremyevans0 I see your point about how ivars take precedence over methods of the same name, but I think `it` is more like a block argument (well, a local variable) than a method, so I find this inconsistently really surprising:
```
ruby --parser=parse.y -e "42.tap { it = it; p it }" # => nil
ruby --parser=parse.y -e "42.tap { |it| it = it; p it }" # => 42
```
Since `it` is just a shorthand for "the first block argument," then I think people would expect that it works _as if_ you declared `|it|` yourself.
----------------------------------------
Bug #21139: Prism and parse.y parses `it = it` differently
https://bugs.ruby-lang.org/issues/21139#change-114180
* Author: tompng (tomoya ishida)
* Status: Feedback
* Assignee: prism
* ruby -v: ruby 3.5.0dev (2025-02-14T16:49:52Z master ee181d1bb7) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
~~~
# ruby --parser=parse.y -e "42.tap { it = it; p it }"
nil
# ruby --parser=prism -e "42.tap { it = it; p it }"
42
~~~
---Files--------------------------------
clipboard-202503081702-idzz2.png (22.6 KB)
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