[ruby-core:23208] [Bug #1381] Confusing Encoding Error

Bug #1381: Confusing Encoding Error
http://redmine.ruby-lang.org/issues/show/1381

Author: James Gray
Status: Open, Priority: Normal
Category: M17N, Target version: 1.9.2
ruby -v: ruby 1.9.2dev (2009-04-13) [i386-darwin9.6.0]

When I reuse a Regexp object, the Encoding seems unchanged but an error message can report something different from what I am seeing:

    $ cat enc_error_bug.rb 
    re = /./
    puts re.encoding.name
    "a".encode("ASCII-8BIT") =~ re if $DEBUG
    puts re.encoding.name
    "a".encode("UTF-16BE") =~ re
    $ ruby enc_error_bug.rb 
    US-ASCII
    US-ASCII
    enc_error_bug.rb:5:in `=~': incompatible encoding regexp match (US-ASCII regexp with UTF-16BE string) (Encoding::CompatibilityError)
    	from enc_error_bug.rb:5:in `<main>'
    $ ruby -d enc_error_bug.rb 
    US-ASCII
    US-ASCII
    Exception `Encoding::CompatibilityError' at enc_error_bug.rb:5 - incompatible encoding regexp match (ASCII-8BIT regexp with UTF-16BE string)
    enc_error_bug.rb:5:in `=~': incompatible encoding regexp match (ASCII-8BIT regexp with UTF-16BE string) (Encoding::CompatibilityError)
    	from enc_error_bug.rb:5:in `<main>'

Notice how the Regexp's Encoding stays US-ASCII, but the error message calls it ASCII-8BIT if I first match it as against an ASCII-8BIT String.


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