[perl #59368] regexp flag m ignored if applied on top of qr, bug or feature of 5.10?

[Mark Martinec (via RT) <perlbug-followup@perl.org>]

# New Ticket Created by  Mark Martinec 
# Please include the string:  [perl #59368]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=59368 >


This is a bug report for perl from Mark.Martinec@ijs.si,
generated with the help of perlbug 1.36 running under perl 5.10.0.


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Seems like a regexp modifier /m is ignored if applied late
to a regexp expression involving a qr compiled regexp.
Perl 5.10.0 behaves differently than 5.8.8 in this regard:

$ perl5.6.2 -le \
  '$r=qr/(.)$/; @a = "abC\ndeF\n"=~/$r/mg; print join ",",@a'
C,F

$ perl5.8.8 -le \
  '$r=qr/(.)$/; @a = "abC\ndeF\n"=~/$r/mg; print join ",",@a'
C,F

$ perl5.10.0 -le \
  '$r=qr/(.)$/; @a = "abC\ndeF\n"=~/$r/mg; print join ",",@a'
F


If the qr expression has a /m modifier itself,
then the result is again as expected:

$ perl5.10.0 -le \
'$r=qr/(.)$/m; @a = "abC\ndeF\n"=~/$r/mg; print join ",",@a'
C,F


Is this a bug in 5.10, or a fix of something that was
broken up until now?

  Mark
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
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Site configuration information for perl 5.10.0:

Configured by mark at Fri Sep 26 14:12:03 UTC 2008.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=freebsd, osvers=7.0-release-p1, archname=amd64-freebsd
    uname='freebsd neli-virtual.ijs.si 7.0-release-p1 freebsd 7.0-release-p1 #0: sun jun 1 03:02:30 cest 2008 
lesi@neli.ijs.si:usrobjusrsrcsysneli amd64 '
    config_args='-ds -e'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags 
='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -I/usr/local/include',
    optimize='-O',
    cppflags='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.2.1 20070719  [FreeBSD]', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-Wl,-E  -L/usr/local/lib'
    libpth=/usr/lib /usr/local/lib
    libs=-lm -lcrypt -lutil -lc
    perllibs=-lm -lcrypt -lutil -lc
    libc=, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-DPIC -fPIC', lddlflags='-shared  -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl 5.10.0:
    /usr/local/lib/perl5/5.10.0/amd64-freebsd
    /usr/local/lib/perl5/5.10.0
    /usr/local/lib/perl5/site_perl/5.10.0/amd64-freebsd
    /usr/local/lib/perl5/site_perl/5.10.0
    /usr/local/lib/perl5/site_perl/5.6.2.OFF
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl 5.10.0:
    HOME=/root
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/zenoss/bin:/usr/local/bin:/usr/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/bash

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Follow-Ups from:

"Rafael Garcia-Suarez" <rgarciasuarez@gmail.com>

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