Bug #2468: Array expansion inside case/when gives unexpected results

• Status: Closed
• Assignee: -
• Target version: Ruby 1.8.8
• ruby -v: ruby 1.8.8dev (2009-12-07 revision 26034) [i386-mswin32_90]

[romuloceccon (Rômulo Ceccon)]

=begin
Given the following script:

arr = [1, 2, 3]

case 2
when 1, 2, 3
puts "2 is in range #{arr.inspect}"
else
puts "2 is out of range #{arr.inspect}"
end

case 2
when *arr # this is the only thing different from the previous statement
puts "2 is in range #{arr.inspect}"
else
puts "2 is out of range #{arr.inspect}"
end

Ruby 1.8.8dev gives me the following output:

$ ruby -v
ruby 1.8.8dev (2009-12-07 revision 26034) [i386-mswin32_90]

$ ruby casebug.rb
2 is in range [1, 2, 3]
2 is out of range [1, 2, 3]

I'd expect the same results other versions give:

$ ruby -v
ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-mswin32_90]

$ ruby casebug.rb
2 is in range [1, 2, 3]
2 is in range [1, 2, 3]

$ ruby -v
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

$ ruby casebug.rb
2 is in range [1, 2, 3]
2 is in range [1, 2, 3]
=end

[knu (Akinori MUSHA)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

=begin
This issue was solved with changeset r26589.
Romulo, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

=end

[marcandre (Marc-Andre Lafortune)]

• Status changed from Closed to Open

=begin

=end

[naruse (Yui NARUSE)]

• Status changed from Open to Closed

=begin

I wish "ref [Bug #...]" would have been parsed just like "cf: [Bug #...]".
#... may change when the ticket moves from bug to backport or something.
So writing ref #... is correct.
=end