From: Sylvain Joyeux <redmine@...>
Date: 2010-02-01T05:09:33+09:00
Subject: [ruby-core:27985] [Bug #2702] Enumerator#to_a and #to_set yield inconsistent results

Bug #2702: Enumerator#to_a and #to_set yield inconsistent results
http://redmine.ruby-lang.org/issues/show/2702

Author: Sylvain Joyeux
Status: Open, Priority: Normal
Category: lib
ruby -v: ruby 1.9.1p378 (2010-01-10 revision 26273) [x86_64-linux]

If I run #to_a and #to_set on an Enumerator with a multiple-argument yield, then I get the following:

[~]% cat test_to_set.rb
require 'set'

def enumerate
    yield(1, 2, 3)
    yield(4, 5, 6)
end

STDERR.puts enum_for(:enumerate).class
STDERR.puts enum_for(:enumerate).to_a.inspect
STDERR.puts enum_for(:enumerate).to_set.inspect

[~]% ruby1.9.1 test_to_set.rb
Enumerator
[[1, 2, 3], [4, 5, 6]]
#<Set: {1, 4}>

Namely, #to_a captures all the arguments provided to yield() while #to_set only gets the first one.

I guess that the #to_set behaviour is a bug (isn't it ?)


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