From: ruby-core@...
Date: 2019-05-27T16:19:36+00:00
Subject: [ruby-core:92864] [Ruby trunk Feature#15881] Optimize deconstruct	in pattern matching

Issue #15881 has been reported by marcandre (Marc-Andre Lafortune).

----------------------------------------
Feature #15881: Optimize deconstruct in pattern matching
https://bugs.ruby-lang.org/issues/15881

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
```ruby
class A
  def deconstruct
    puts 'deconstruct called'
    [1]
  end
end

case A.new
in [2]
  2
in [1]
  1
else
end

# => 1, prints "deconstruct called"
```

Shouldn't `deconstruct called` print only once, whenever the first deconstruction needed occurs?



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