Issue #8151 has been updated by akr (Akira Tanaka).

Assignee changed from akr (Akira Tanaka) to naruse (Yui NARUSE)

The warning is proposed by [ruby-core:24593] [Feature #1831] (2009-07-29) and committed by naruse.

It is seven years later than my Regexp#to_s [ruby-dev:16951] (2002-04-18)

It seems this issue is better to assign naruse.
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Bug #8151: Duplicate character class warning
https://bugs.ruby-lang.org/issues/8151#change-38094

Author: tenderlovemaking (Aaron Patterson)
Status: Assigned
Priority: Normal
Assignee: naruse (Yui NARUSE)
Category: 
Target version: 
ruby -v: ruby 1.9.3p374 (2013-01-15 revision 38858) [x86_64-darwin12.2.1]


I get a duplicate character class warning, but I think it's a bug.  Here is the example code:

```
def embed exp, depth
  return exp if depth == 0
  embed(/#{exp}/, depth - 1)
end

3.times { |i|
  puts "DEPTH #{i + 1}"
  embed(/[a-z\u{7b}-\u{7d}]/, i + 1)
}
```

At depth = 1, there is no warning, but greater than 1, I get a duplicate character class warning.  I don't think the character class overlaps, so there should never be a warning.


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