[ruby-core:121338] [Ruby master Bug#21139] Prism and parse.y parses `it = it` differently
From:
"matz (Yukihiro Matsumoto) via ruby-core" <ruby-core@...>
Date:
2025-03-13 12:11:42 UTC
List:
ruby-core #121338
Issue #21139 has been updated by matz (Yukihiro Matsumoto).
I said I prefer Prism behavior to `parse.y`. But It was due to my misunderstanding. `it = it` should initialize the local variable named `it` and the value should be `nil`, just like other `x = x` assignment in Ruby.
In the future, all assignment to `it` could be prohibited, maybe.
Matz.
----------------------------------------
Bug #21139: Prism and parse.y parses `it = it` differently
https://bugs.ruby-lang.org/issues/21139#change-112308
* Author: tompng (tomoya ishida)
* Status: Open
* 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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