Bug #1953: empty range in String#tr causes unexpected behavior

• Status: Closed
• Assignee: matz (Yukihiro Matsumoto)
• Target version: 2.0.0
• ruby -v: ruby 1.9.2dev (2009-08-18 trunk 24578) [i686-linux

[mame (Yusuke Endoh)]

=begin
Are these intentional?

"ABC".tr("ABC", "pq-a") #=> "pqq"
"ABC".tr("ABC", "pq-ar") #=> "prr"
"ABC".tr("ABC", "pq-ars") #=> "prs"
"ABC".tr("ABC", "pq-arst") #=> "prs"

I expect that an exception is raised or that "p-a" equals to
"ponmlk...cba" (descending order).

For reference, empty range is rejected in Perl:

$ perl -e '"A" =~ tr/A/q-a/;'
Invalid range "q-a" in transliteration operator at -e line 1.

--
Yusuke ENDOH [e-mail]
=end

[naruse (Yui NARUSE)]

• Category set to core
• Status changed from Open to Assigned
• Assignee set to matz (Yukihiro Matsumoto)

=begin

=end

[matz (Yukihiro Matsumoto)]

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

=begin
This issue was solved with changeset r25576.
Yusuke, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

=end