From: "matz (Yukihiro Matsumoto)" <matz@...>
Date: 2013-05-29T10:23:16+09:00
Subject: [ruby-core:55188] [ruby-trunk - Bug #8457][Closed] Function arguments: Is this intended?


Issue #8457 has been updated by matz (Yukihiro Matsumoto).

Status changed from Open to Closed

I am not sure what you meant, but I am sure you are fooled by side-effect of #concat method.

  a = [1, 2]
  a.tap {|*p|    # p is an array that wraps a i.e. p=[a]
    a.clear      # a is cleared; now p=[[]]
    a.concat p   # you concat p, that contains reference to a to a, make it circular
  } # => a = [a]

This is not a bug.
----------------------------------------
Bug #8457: Function arguments: Is this intended?
https://bugs.ruby-lang.org/issues/8457#change-39550

Author: boris_stitnicky (Boris Stitnicky)
Status: Closed
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: 2.0.0
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


a = [1, 2, x: 3]
a.tap { |*p, q| a.clear.concat p } #=> [1, 2]

but

a = [1, 2, x: 3]
a.tap { |*p, **q| a.clear.concat p } #=> [[...]]

and also

a = [1, 2]
a.tap { |*p| a.clear.concat p } #=> [[...]]

???


-- 
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