Re: [PATCH 2/9] dfa: fix handling of ranges in multibyte character sets

[Paolo Bonzini]

> Hi Paolo,
>
> Do you have a test that exercises this fix?
> As far as I can see, the above tests currently succeed
> with grep built from master.  I expected them to fail.

It passes because strcoll (and hences ranges) is case-insensitive in 
many locales:

$ printf '1\ny\n.\n' | LC_ALL=en_US.UTF-8 grep '[A-Z]'
y

(Note no -i).  It would fail in something like C.UTF-8, but it is not 
portable and as far as I know it only works under Cygwin---not even 
glibc supports it:

$ LC_ALL=C.UTF-8 bash
bash: warning: setlocale: LC_ALL: cannot change locale (C.UTF-8)

So I included the test more for completeness than anything else, hoping 
that we get coverage on a system where strcoll is case sensitive.

Paolo