From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2023-07-29T05:05:37+00:00
Subject: [ruby-core:114305] [Ruby master Bug#19786] Data::define() does not work as documented

Issue #19786 has been updated by nagachika (Tomoyuki Chikanaga).



Backport changed from 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED to 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE



ruby_3_2 19a3466a1460924058ca16a259601bb753293d43 merged revision(s) cada537040743cbe49aac6740816d648ca0d3fb.



----------------------------------------

Bug #19786: Data::define() does not work as documented

https://bugs.ruby-lang.org/issues/19786#change-104005



* Author: thyresias (Thierry Lambert)

* Status: Closed

* Priority: Normal

* ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt]

* Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE

----------------------------------------

Not sure if this is a bug or a feature.



RDoc documentation for Data::define:



> define(name, *symbols) ��� class

> define(*symbols) ��� class

> 

> Defines a new Data class.

> If the first argument is a string, the class is stored in Data::<name> constant.



```ruby

M1 = Data.define('Measure', :amount, :unit)



p M1  #=> M1

p M1.members  #=> [:Measure, :amount, :unit]



S1 = Struct.new('Measure', :amount, :unit)



p S1  #=> Struct::Measure

p S1.members  #=> [:amount, :unit]

```



Unlike `Struct.new`, `Data.define` does not accept a name as first argument: it converts it to a symbol, and therefore a member.

There is no trace of `Data::Measure` in the example above, while we do have `Struct::Measure`.







-- 

https://bugs.ruby-lang.org/

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