From: "kinoppyd (Yasuhiro Kinoshita) via ruby-core" <ruby-core@...>
Date: 2025-02-14T07:42:18+00:00
Subject: [ruby-core:121041] [Ruby master Bug#21137] Compound assignment operator with "it" parsed differently between parse.y and prism

Issue #21137 has been reported by kinoppyd (Yasuhiro Kinoshita).

----------------------------------------
Bug #21137: Compound assignment operator with "it" parsed differently between parse.y and prism
https://bugs.ruby-lang.org/issues/21137

* Author: kinoppyd (Yasuhiro Kinoshita)
* Status: Open
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [arm64-darwin21]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
``` ruby
# parse.y OK: no error
# prism   OK: no error
proc { it = 1 }

# parse.y OK: no error
# prism   OK: no error
proc { it = it + 1 }

# parse.y OK: no error
# prism   NG: syntax errors found (SyntaxError)
proc { it += 1 }
```



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