[perl #122151] pack/unpack should warn about redundant arguments

# New Ticket Created by  Ævar Arnfjörð Bjarmason 
# Please include the string:  [perl #122151]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=122151 >



This is a bug report for perl from avar@cpan.org,
generated with the help of perlbug 1.40 running under perl 5.21.2.


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[Please describe your issue here]

Similarly to https://rt.perl.org/Ticket/Display.html?id=121025 which
I've now implemented in
http://perl5.git.perl.org/perl.git/commitdiff/4077a6b the pack family
of functions don't warn about redundant arguments, but should:

    $ perl -wE 'say pack "AA", qw(x y z)'
    xy
    $ perl -wE 'say pack "AAAA", qw(x y z)'
    xyz


[Please do not change anything below this line]
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---
Flags:
    category=core
    severity=wishlist
---
Site configuration information for perl 5.21.2:

Configured by avar at Sat Jun 21 13:02:19 UTC 2014.

Summary of my perl5 (revision 5 version 21 subversion 2) configuration:
  Local Commit: b1115217c095e04e8978853ee6f91dcaf13c3213
  Ancestor: 0c60e3193cada7eee789f68009742a6f1c55c0ac
  Platform:
    osname=linux, osvers=3.2.0-4-amd64, archname=x86_64-linux-thread-multi
    uname='linux u.nix.is 3.2.0-4-amd64 #1 smp debian 3.2.35-2 x86_64 gnulinux '
    config_args='-DDEBUGGING=both -Doptimize=-ggdb3 -Dusethreads -Dprefix=/home/avar/perl5/installed -Dusedevel -des'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-ggdb3',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.2.1 Compatible Debian Clang 3.3 (branches/release_33)', 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 /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
    libs=-lnsl -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=libc-2.18.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.18'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -ggdb3 -L/usr/local/lib -fstack-protector'

Locally applied patches:
    d1e978ede81bb0602bdb1f26093a7b58d245bcec
    946bd120154b4b2b68a03ca473e15e5f03eb2ff6

---
@INC for perl 5.21.2:
    lib
    /home/avar/perl5/installed/lib/site_perl/5.21.2/x86_64-linux-thread-multi
    /home/avar/perl5/installed/lib/site_perl/5.21.2
    /home/avar/perl5/installed/lib/5.21.2/x86_64-linux-thread-multi
    /home/avar/perl5/installed/lib/5.21.2
    /home/avar/perl5/installed/lib/site_perl
    .

---
Environment for perl 5.21.2:
    HOME=/home/avar
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/avar/local/bin:/home/avar/perl5/installed/bin:/home/v-perlbrew/perl5/perlbrew/perls/perl-5.19.6/bin:/home/v-perlbrew/perl5/perlbrew/bin:/home/v-perlbrew/perl5/perlbrew/perls/current/bin:/home/avar/local/bin:/home/avar/g/misc-scripts:/home/avar/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
    PERLDOC=-MPod::Text::Ansi
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #122151] pack/unpack should warn about redundant arguments by Ævar Arnfjörð Bjarmason
• Re: [perl #122151] pack/unpack should warn about redundantarguments by H.Merijn Brand
• [perl #122151] pack/unpack should warn about redundant arguments by Ævar Arnfjörð Bjarmason via RT
• [perl #122151] pack/unpack should warn about redundant arguments by Ævar Arnfjörð Bjarmason via RT