From: ruby-core@...
Date: 2019-06-12T14:20:58+00:00
Subject: [ruby-core:93077] [Ruby trunk Bug#15918] Pattern matching for Set

Issue #15918 has been updated by marcandre (Marc-Andre Lafortune).


Eregon (Benoit Daloze) wrote:
> Did you mean `in Set[1, 2, 3]` ?

I didn't, but it should match too; it's the same as my example but with the added constraint that the object should be a descendant a `Set`. Note that `in Set[1, 2, 3]` does *not* call `Set.[](1, 2, 3)`...


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Bug #15918: Pattern matching for Set
https://bugs.ruby-lang.org/issues/15918#change-78490

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Currently, `Set` does not respond to `deconstruct`. Shouldn't we implement it using `to_a`?

```
require 'set'
case Set[1, 2, 3]
in [1, 2, 3]
  p "match"
else
  p "no match"
end
# => "no match", should be "match"
```




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