From @miyagawa

The following test fails both on 5.10.1 and blead (per chip on #p5p).

The bareword on the left side of fat comma (=>) always gets utf8 flag
set, even if the characters only consist of ascii chars. See
http​://www.perlmonks.org/?node_id=668987 for more details.

use strict;
use utf8;
use Test​::More tests => 2;

my %foo = (a => 'b', 'c' => 'd');

for my $key (keys %foo) {
  ok !utf8​::is_utf8($key), "'$key' shouldn't have utf8 flag";
}

Flags​:
  category=
  severity=

This perlbug was built using Perl 5.10.0 - Sat Jul 25 12​:57​:07 PDT 2009
It is being executed now by Perl 5.10.1 - Wed Aug 19 01​:25​:08 PDT 2009.

Site configuration information for perl 5.10.1​:

Configured by miyagawa at Wed Aug 19 01​:25​:08 PDT 2009.

Summary of my perl5 (revision 5 version 10 subversion 1) configuration​:

  Platform​:
  osname=darwin, osvers=9.7.0, archname=darwin-2level
  uname='darwin macbook-miyagawa.local 9.7.0 darwin kernel version
9.7.0​: tue mar 31 22​:52​:17 pdt 2009; root​:xnu-1228.12.14~1release_i386
i386 '
  config_args='-Dprefix=/opt/local -des'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=undef, usemultiplicity=undef
  useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
  use64bitint=undef, use64bitall=undef, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-fno-common -DPERL_DARWIN -no-cpp-precomp
-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include
-I/opt/local/include',
  optimize='-O3',
  cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN
-no-cpp-precomp -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -I/opt/local/include'
  ccversion='', gccversion='4.0.1 (Apple Inc. build 5493)', gccosandvers=''
  intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
  ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags ='
-fstack-protector -L/usr/local/lib -L/opt/local/lib'
  libpth=/usr/local/lib /opt/local/lib /usr/lib
  libs=-ldbm -ldl -lm -lutil -lc
  perllibs=-ldl -lm -lutil -lc
  libc=/usr/lib/libc.dylib, so=dylib, useshrplib=false, libperl=libperl.a
  gnulibc_version=''
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
  cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup
-L/usr/local/lib -L/opt/local/lib -fstack-protector'

Locally applied patches​:

@​INC for perl 5.10.1​:
  /opt/local/lib/perl5/5.10.1/darwin-2level
  /opt/local/lib/perl5/5.10.1
  /opt/local/lib/perl5/site_perl/5.10.1/darwin-2level
  /opt/local/lib/perl5/site_perl/5.10.1
  .

Environment for perl 5.10.1​:
  DYLD_LIBRARY_PATH (unset)
  HOME=/Users/miyagawa
  LANG=ja_JP.UTF-8
  LANGUAGE (unset)
  LC_MESSAGES=C
  LC_TIME=C
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/Users/miyagawa/.gem/ruby/1.8/bin​:/Users/miyagawa/perl5/bin​:/Users/miyagawa/local/bin​:/Users/miyagawa/bin​:/sbin​:/usr/sbin​:/usr/local/sbin​:/bin​:/usr/local/bin​:/usr/bin​:/usr/local/ssl/bin​:/usr/local/samba/bin​:/usr/local/java/bin​:/var/qmail/bin​:/usr/local/pgsql/bin​:/usr/local/mysql/bin​:/usr/local/apache/bin​:/usr/local/squid/bin​:/usr/local/git/bin​:/opt/local/bin​:/opt/local/sbin
  PERL5LIB=
  PERL_AUTOINSTALL_PREFER_CPAN=1
  PERL_BADLANG=0
  PERL_MM_OPT=INSTALL_BASE=/Users/miyagawa/perl5
  SHELL=/bin/tcsh

From @chipdude

fixed in blead

@chipdude - Status changed from 'new' to 'resolved'

From aar@cpan.org

It seems that this bug was fixed in 5.12. Can you update this ticket with such information?
Thank you!