From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2023-10-26T05:35:09+00:00
Subject: [ruby-core:115176] [Ruby master Bug#19973] Duplicate keyword argument names don't always warn

Issue #19973 has been updated by nobu (Nobuyoshi Nakada).

Backport changed from 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN to 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED

https://github.com/ruby/ruby/pull/8771

----------------------------------------
Bug #19973: Duplicate keyword argument names don't always warn
https://bugs.ruby-lang.org/issues/19973#change-105088

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-10-24T19:38:50Z cleanup 3525a9bd22) [arm64-darwin23]
* Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED
----------------------------------------
Calling a method with duplicate keyword arguments doesn't warn when it could:


```ruby
def bar a:, b:
  a + b
end

# Warning
bar(a: 1, b: 3, a: 2)

z = { b: 123 }
# No warning
bar(a: 1, **z, a: 2)
```

The first call to `bar` gives a warning about duplicate keyword args, but the second call doesn't.  I think both cases should emit a warning.



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