From: "k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date: 2026-04-04T03:20:51+00:00
Subject: [ruby-core:125190] [Ruby Bug#21844] Inconsistent ArgumentError message for Data::define.new

Issue #21844 has been updated by k0kubun (Takashi Kokubun).

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

ruby_4_0 commit:7ba583d753411a39dec78ea6e7c8d2701b04c118 merged revision(s) commit:c27ae8d91aadca0660070ee1eeae9598b1fe47ee, commit:b6e6ccc6c22ebb464ce101e42a14e7daea2a80b6, commit:cbca59377ebfa1bc1183322fa9d9d0067d445c24.

----------------------------------------
Bug #21844: Inconsistent ArgumentError message for Data::define.new
https://bugs.ruby-lang.org/issues/21844#change-116923

* Author: jnchito (Junichi Ito)
* Status: Closed
* ruby -v: ruby 4.0.1 (2026-01-13 revision e04267a14b) +PRISM [arm64-darwin25]
* Backport: 3.2: WONTFIX, 3.3: REQUIRED, 3.4: REQUIRED, 4.0: DONE
----------------------------------------
The code below shows `Data::define.new` treats symbol and string keys equivalently:

``` ruby
C = Data.define(:a, :b)

C.new(a: 1, b: 1)
#=> #<data C a=1, b=1>

C.new('a' => 1, 'b' => 1)
#=> #<data C a=1, b=1>
```

But it acts differently when detecting missing keywords:

```ruby
C.new(a: 1)
#=> 'Data#initialize': missing keyword: :b (ArgumentError)
C.new('a' => 1)
#=> 'Data#initialize': missing keywords: :a, :b (ArgumentError)
```

I feel it should work like this:

```ruby
C.new('a' => 1)
#=> 'Data#initialize': missing keyword: :b (ArgumentError)
```

I created a PR to fix it:

https://github.com/ruby/ruby/pull/15910



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