Feature #1831: Suggestion: warn on repeated character in character class
http://redmine.ruby-lang.org/issues/show/1831

Author: Brian Candler
Status: Open, Priority: Low
Category: core

Suggestion: warn if the same character appears more than once in a character class (or more restrictedly: if the character ':' appears both at the start and end of a character class)

This is to give some indication of the problem if you do the following:

>> RUBY_DESCRIPTION
=> "ruby 1.9.2dev (2009-07-18 trunk 24186) [i686-linux]"
>> $WARN=true
=> true
>> "uber" =~ /[:lower:]/
=> 2


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