[perl #111338] Warnings in utf8 subcategories do nothing in isolation

# New Ticket Created by  Aaron Crane 
# Please include the string:  [perl #111338]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=111338 >


This is a bug report for perl from arc@cpan.org,
generated with the help of perlbug 1.39 running under perl 5.15.8.


-----------------------------------------------------------------
[Please describe your issue here]

When used in isolation, the C<non_unicode>, C<nonchar>, and
C<surrogate> warning subcategories don't trigger the emission of
the relevant warnings; though using their parent category C<utf8>
does.

For example:

$ ./perl -CS -e 'use warnings "nonchar"; print chr 0xffff' > /dev/null
$ ./perl -CS -e 'use warnings "utf8"; print chr 0xffff' > /dev/null
Unicode non-character U+FFFF is illegal for open interchange at -e line 1.

Patch attached, containing failing tests.


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=library
    severity=low
---
Site configuration information for perl 5.15.8:

Configured by aaron at Sat Feb 25 12:07:10 GMT 2012.

Summary of my perl5 (revision 5 version 15 subversion 8) configuration:
  Commit id: 236cbe8d7a6747fb6144c93dd767895f8acffd00
  Platform:
    osname=linux, osvers=3.0.0-14-server, archname=x86_64-linux
    uname='linux redacted 3.0.0-14-server #23~lucid1-ubuntu smp thu
dec 8 14:50:26 utc 201
1 x86_64 gnulinux '
    config_args='-des -Dusedevel -Dprefix=/var/tmp/bleadperl'
    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 ='-fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.4.3', 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 =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib/../lib /usr/lib/../lib /lib /usr/lib
/lib64 /usr/lib64
    libs=-lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.11.1.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.11.1'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib
-fstack-protector'

Locally applied patches:


---
@INC for perl 5.15.8:
    /var/tmp/bleadperl/lib/site_perl/5.15.8/x86_64-linux
    /var/tmp/bleadperl/lib/site_perl/5.15.8
    /var/tmp/bleadperl/lib/5.15.8/x86_64-linux
    /var/tmp/bleadperl/lib/5.15.8
    .

---
Environment for perl 5.15.8:
    HOME=/home/aaron
    LANG=en_GB.UTF-8
    LANGUAGE (unset)
    LC_COLLATE=C
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

-- 
Aaron Crane ** http://aaroncrane.co.uk/

• [perl #111338] Warnings in utf8 subcategories do nothing in isolation by Aaron Crane