[ruby-core:123980] [Ruby Bug#21757] Splatted args array is mutated when passing unexpected kwargs

[ruby-core:123980] [Ruby Bug#21757] Splatted args array is mutated when passing unexpected kwargs

[apotonick (Nick Sutterer) via ruby-core]

Issue #21757 has been reported by apotonick (Nick Sutterer).

----------------------------------------
Bug #21757: Splatted args array is mutated when passing unexpected kwargs
https://bugs.ruby-lang.org/issues/21757

* Author: apotonick (Nick Sutterer)
* Status: Open
* ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
The bug is very simple to provoke.

``` ruby
proc = ->(*) { } # we do NOT expect any keyword arguments.

args = [1, 2]

proc.(*args, bug: true)

pp args #=> [1, 2, {bug: true}]

```

The `args` array now has a third element which is exactly what got passed as keyword arguments. This is only in Ruby 3.4, 3.3 and below discard the "unexpected" keyword arguments as expected.




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[ruby-core:123984] [Ruby Bug#21757] Splatted args array is mutated when passing unexpected kwargs

[jeremyevans0 (Jeremy Evans) via ruby-core]

Issue #21757 has been updated by jeremyevans0 (Jeremy Evans).

Assignee set to jeremyevans0 (Jeremy Evans)
Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED

Thank you for the report. This is a bug in the allocationless anonymous splat optimization in Ruby 3.4, still present in the master branch. I'll work on a fix.

----------------------------------------
Bug #21757: Splatted args array is mutated when passing unexpected kwargs
https://bugs.ruby-lang.org/issues/21757#change-115412

* Author: apotonick (Nick Sutterer)
* Status: Open
* Assignee: jeremyevans0 (Jeremy Evans)
* ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED
----------------------------------------
The bug is very simple to provoke.

``` ruby
proc = ->(*) { } # we do NOT expect any keyword arguments.

args = [1, 2]

proc.(*args, bug: true)

pp args #=> [1, 2, {bug: true}]

```

The `args` array now has a third element which is exactly what got passed as keyword arguments. This is only in Ruby 3.4, 3.3 and below discard the "unexpected" keyword arguments as expected.




-- 
https://bugs.ruby-lang.org/
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[ruby-core:123991] [Ruby Bug#21757] Splatted args array is mutated when passing unexpected kwargs

[jeremyevans0 (Jeremy Evans) via ruby-core]

Issue #21757 has been updated by jeremyevans0 (Jeremy Evans).


I submitted a pull request to fix this: https://github.com/ruby/ruby/pull/15383

----------------------------------------
Bug #21757: Splatted args array is mutated when passing unexpected kwargs
https://bugs.ruby-lang.org/issues/21757#change-115418

* Author: apotonick (Nick Sutterer)
* Status: Open
* Assignee: jeremyevans0 (Jeremy Evans)
* ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED
----------------------------------------
The bug is very simple to provoke.

``` ruby
proc = ->(*) { } # we do NOT expect any keyword arguments.

args = [1, 2]

proc.(*args, bug: true)

pp args #=> [1, 2, {bug: true}]

```

The `args` array now has a third element which is exactly what got passed as keyword arguments. This is only in Ruby 3.4, 3.3 and below discard the "unexpected" keyword arguments as expected.




-- 
https://bugs.ruby-lang.org/
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 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
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