From: Robert Dober <robert.dober@...>
Date: 2007-08-18T19:48:18+09:00
Subject: Bug in select?

Hi
I was just testing Labrador with JRuby when JRuby failed a test MR
passed, after some investigation I do have the feeling that JRuby is
correct and MR is not.
Could someone tell me if I am wrong?
Here goes what seems quite normal to me:
510/9 > ruby -e '{:a=>42,:b=>46}.each{|x| p x}'
[:b, 46]
[:a, 42]
robert@PC:/cygdrive/d/dober 12:32:01
511/10 > jruby -e '{:a=>42,:b=>46}.each{|x| p x}'
[:a, 42]
[:b, 46]
robert@PC:/cygdrive/d/dober 12:32:06
512/11 > ruby -e '{:a=>42,:b=>46}.each{|*x| p x}'
[[:b, 46]]
[[:a, 42]]
robert@PC:/cygdrive/d/dober 12:32:14
513/12 > jruby -e '{:a=>42,:b=>46}.each{|*x| p x}'
[[:a, 42]]
[[:b, 46]]

map has the same block parameter passing semantics as each of course
516/15 > ruby -e '{:a=>42,:b=>46}.map{|*x| p x}'
[[:b, 46]]
[[:a, 42]]
robert@PC:/cygdrive/d/dober 12:46:17
517/16 > jruby -e '{:a=>42,:b=>46}.map{|*x| p x}'
[[:a, 42]]
[[:b, 46]]

but now look at select please
518/17 > ruby -e '{:a=>42,:b=>46}.select{|*x| p x}'

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
[:b, 46]
[:a, 42]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
robert@PC:/cygdrive/d/dober 12:47:20
519/18 > jruby -e '{:a=>42,:b=>46}.select{|*x| p x}'
[[:a, 42]]
[[:b, 46]]

Is it just me or is it really broken?

Thx in advance.

Robert
-- 
I'm an atheist and that's it. I believe there's nothing we can know
except that we should be kind to each other and do what we can for
other people.
-- Katharine Hepburn