Warning "Using exec() instead of system()" not given when assigning to a variable

# New Ticket Created by  Aron Andersson 
# Please include the string:  [perl #45621]
# in the subject line of all future correspondence about
this issue. 
# <URL: h
ttp://rt.perl.org/rt3/Ticket/Display.html?id=45621 >


This is a bug report for perl from aroncs.umu.se,
generated with the help of perlbug 1.35 running under perl
v5.8.8.


------------------------------------------------------------
-----
When running perl with -W, -w or "use warnings;",
Perl should warn if exec
is followed by another statement which is not die, warn or
exit. However, if
you try to assign the return value of exec to a variable,
this warning never
gets issued, even though the documentation says that it
should.

Example 1: (Warning issued)
exec("ls");
print "Foo";

Example 2: (No warning issued)
my $var = exec("ls");
print "$var";

/Aron
[Please do not change anything below this line]
------------------------------------------------------------
-----
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.8.8:

Configured by Debian Project at Tue Mar  6 01:52:23 UTC
2007.

Summary of my perl5 (revision 5 version 8 subversion 8)
configuration:
  Platform:
    osname=linux, osvers=2.6.15.7,
archname=i486-linux-gnu-thread-multi
    uname='linux rothera 2.6.15.7 #1 smp sat sep 30 10:21:42
utc 2006 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles
-Dccflags=-DDEBIAN -Dcccdlflags=-fPIC
-Darchname=i486-linux-gnu -Dprefix=/usr
-Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8
-Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5
-Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local
-Dsitelib=/usr/local/share/perl/5.8.8
-Dsitearch=/usr/local/lib/perl/5.8.8
-Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3
-Dsiteman1dir=/usr/local/man/man1
-Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1
-Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs
-Ud_csh -Uusesfio -Uusenm -Duseshrplib
-Dlibperl=libperl.so.5.8.8 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef
useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define
usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE
-DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe
-I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS
-DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.1.2 (Ubuntu
4.1.2-0ubuntu4)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8,
byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define,
longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8,
Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc
-lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.5.so, so=so, useshrplib=true,
libperl=libperl.so.5.8.8
    gnulibc_version='2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef,
ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared
-L/usr/local/lib'

Locally applied patches:
    

---
INC
for perl v5.8.8:
    /etc/perl
    /usr/local/lib/perl/5.8.8
    /usr/local/share/perl/5.8.8
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8
    /usr/share/perl/5.8
    /usr/local/lib/site_perl
    .

---
Environment for perl v5.8.8:
    HOME=/home/aron
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_CTYPE=sv_SE
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
   
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin
:/bin:/usr/games
    PERL=/usr/bin/perl
    PERL_BADLANG (unset)
    SHELL=/bin/bash