Bug #7471: character class has duplicated range warning for "" =~ /[\w\W]/

• Status: Closed
• Assignee: naruse (Yui NARUSE)
• Target version: 2.0.0
• ruby -v: -

[drbrain (Eric Hodel)]

=begin
The warning seems bogus, \w and \W do not overlap.

$ cat test.rb
$-w = true

""=~/[\w\W]/
$ make runruby
/Users/drbrain/Work/svn/ruby/trunk/test.rb:3: warning: character class has duplicated range: /[\w\W]/

There is no warning with 1.9.3:

$ ~/.multiruby/install/1.9.3-p194/bin/ruby -v test.rb
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin12.1.0]
[no output]

This affects abbrev.rb:

/usr/local/lib/ruby/2.0.0/abbrev.rb:77: warning: character class has duplicated range: /[\w\W]\z/

=end

[knu (Akinori MUSHA)]

• Assignee changed from usa (Usaku NAKAMURA) to knu (Akinori MUSHA)

[knu (Akinori MUSHA)]

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

This issue was solved with changeset r38028.
Eric, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

Stop using a regexp that causes a false warning.

• lib/abbrev.rb (Abbrev#abbrev): Stop using a regexp that causes a
  false warning. [Bug #7471]

[knu (Akinori MUSHA)]

• Status changed from Closed to Open
• Assignee changed from knu (Akinori MUSHA) to naruse (Yui NARUSE)

While I worked around this, the warning itself looks like a bug in our regexp engine (Onigmo?).

[knu (Akinori MUSHA)]

Onigmo doesn't have the code for detecting duplication in character class, so this problem seems to be on our own.

I narrowed the problem down:

% ruby@2.0.0 -EUS-ASCII -W2 -e '/[\D]/=""'
-e:1: warning: character class has duplicated range: /[\D]/
% ruby@2.0.0 -EUS-ASCII -W2 -e '/[\W]/=""'
-e:1: warning: character class has duplicated range: /[\W]/

Looks like CTYPE + NOT = FAIL.

[usa (Usaku NAKAMURA)]

• Status changed from Open to Assigned

[naruse (Yui NARUSE)]

• Status changed from Assigned to Closed

This issue was solved with changeset r38805.
Eric, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• regparse.c (add_ctype_to_cc): don't check dup warn on adding
  negative ctype to cclass. [Bug #7471] [ruby-core:50344]