[ruby-core:121063] [Ruby master Bug#21139] Prism and parse.y parses `it = it` differently
From:
"nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date:
2025-02-15 03:21:23 UTC
List:
ruby-core #121063
Issue #21139 has been updated by nobu (Nobuyoshi Nakada).
matz (Yukihiro Matsumoto) wrote in #note-1:
> Assignment to `it` should be prohibited in the long run. Temporarily, I vote for Prism behavior.
1. Currently, `it` is an ordinary local variable if assigned syntactically.
2. And a local variable is `nil` before assigned, even in its RHS, at the runtime.
The behavior in parse.y obeys above principles.
Do you want to change the rule 1, make `it` always special?
----------------------------------------
Bug #21139: Prism and parse.y parses `it = it` differently
https://bugs.ruby-lang.org/issues/21139#change-111976
* Author: tompng (tomoya ishida)
* Status: Assigned
* 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
~~~
--
https://bugs.ruby-lang.org/
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