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From: "jeremyevans0 (Jeremy Evans) via ruby-core"
Date: 2025-06-09T21:30:40+00:00
Subject: [ruby-core:122501] [Ruby Bug#21402] ruby2_keywords affects methods/procs with post arguments
Issue #21402 has been reported by jeremyevans0 (Jeremy Evans).
----------------------------------------
Bug #21402: ruby2_keywords affects methods/procs with post arguments
https://bugs.ruby-lang.org/issues/21402
* Author: jeremyevans0 (Jeremy Evans)
* Status: Open
* Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED
----------------------------------------
I believe this is an oversight. We forgot to consider post arguments during the development of `ruby2_keywords`. I believe we should not allow `ruby2_keywords` on methods/procs with post arguments. Example:
```ruby
def a(*c, **kw) [c, kw] end
def b(*a, b) a(*a, b) end
ruby2_keywords(:b)
b({foo: 1}, bar: 1)
# Currently: [[{foo: 1}], {bar: 1}]
# Expected: [[{foo: 1}, {bar: 1}], {}]
```
I think the current behavior is unexpected and undesired, because instead of flagging the last element in the splat array, it flags a post argument.
I've submitted a pull request to fix this: https://github.com/ruby/ruby/pull/13475
--
https://bugs.ruby-lang.org/
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