Re: [perl #118297] perlbug AutoReply: Mixing up- and down-gradedstrings in regex broken in 5.18.0

More specifically, the error occurs when a variable containing a 
downgraded non-ASCII string is interpolated in a regex after an upgraded 
one.

This doesn't warn:

   $ perl -e 'utf8::upgrade(my $u = "\x{e5}"); utf8::downgrade(my $d = 
"\x{e5}"); qr{$d $u}'

Nor does this:

   $ perl -e 'utf8::downgrade(my $d = "\x{e5}"); qr{\x{666} $d}'

-- 
ilmari

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• Re: [perl #118297] perlbug AutoReply: Mixing up- and down-gradedstrings in regex broken in 5.18.0 by D. Ilmari Mannsåker