From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2026-06-07T13:48:15+00:00
Subject: [ruby-core:125634] [Ruby Bug#21674] Possible regression in return case in statement

Issue #21674 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED, 4.0: DONE to 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONE, 4.0: DONE

Backported into ruby_3_4 with https://github.com/ruby/ruby/pull/16324.

----------------------------------------
Bug #21674: Possible regression in return case in statement
https://bugs.ruby-lang.org/issues/21674#change-117484

* Author: jandudulski (Jan Dudulski)
* Status: Closed
* Assignee: prism
* ruby -v: 3.4.6
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONE, 4.0: DONE
----------------------------------------
Suddenly my code started failing in Ruby 3.4.6 and 3.4.7. Shortest code example:

``` ruby
args = [:increased]
context = Data.define(:event).new(:decreased)
case args
in [event]
  context.event in ^event
end
```

In Ruby prior to 3.4.6 it returns `false` (as expected) but in 3.4.6 and 3.4.7 it returns `:decreased`. `context.event in ^event` still returns `false`.



-- 
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