[ruby-core:101744] [Ruby master Bug#17481] Keyword arguments change value after calling super without arguments in Ruby 3.0

Issue #17481 has been updated by nobu (Nobuyoshi Nakada).


Bisect resulted in commit:d2c41b1bff1f3102544bb0d03d4e82356d034d33.

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Bug #17481: Keyword arguments change value after calling super without arguments in Ruby 3.0
https://bugs.ruby-lang.org/issues/17481#change-89565

* Author: janko (Janko Marohnić)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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There seems to be a bug in Ruby 3.0 regarding keyword arguments and calling super without arguments, where the splatted variable changes its value after super is called. The following self-contained example reproduces the issue:

``` ruby
class BaseTest
  def call(a:, b:, **)
  end
end

class Test < BaseTest
  def call(a:, b:, **options)
    p options
    super
    p options
  end
end

Test.new.call(a: 1, b: 2, c: {})
```
```
{:c=>{}}
{:c=>{}, :a=>1, :b=>2}
```

We can see that the `options` variable changed value to all keyword arguments after `super` was called. This doesn't happen when explicitly passing arguments to `super`, i.e. `super(a: a, b: b, **options)`.



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