[ID 20010331.003] No warning under -w for use of push/unshiftcalled with just ARRAY and ommittance of EXPR

This is a bug report for perl from Administrator@localhost,
generated with the help of perlbug 1.28 running under perl v5.6.0.

perl -wle '@a = (1..10); for (@a) {push @b;} $a = @b; print $a;' # prints 0---
 
Description:
When using unshift/push with just ARRAY and not EXPR, one is basicly assigning "" to ARRAY, which seems futile
Perl does not warn for this tho under -w

Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.6.0:

Configured by Administrator at Fri Dec 15 16:26:56 2000.

Summary of my perl5 (revision 5 version 6 subversion 0) configuration:
  Platform:
    osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
    uname=''
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    usethreads=undef use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=undef d_sfio=undef uselargefiles=undef 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='cl', optimize='-O1 -MD -DNDEBUG', gccversion=
    cppflags='-DWIN32'
    ccflags ='-O1 -MD -DNDEBUG -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT  -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='link', ldflags ='-nologo -nodefaultlib -release  -libpath:"E:\Perl\lib\CORE"  -machine:x86'
    libpth="E:\Perl\lib\CORE"
    libs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib  comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib  netapi32.lib uuid.lib wsock32.lib mpr.lib winmm.lib  version.lib odbc32.lib odbccp32.lib msvcrt.lib
    libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl56.lib
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -release  -libpath:"E:\Perl\lib\CORE"  -machine:x86'

Locally applied patches:
    ACTIVEPERL_LOCAL_PATCHES_ENTRY

---
@INC for perl v5.6.0:
    E:/Perl/lib
    E:/Perl/site/lib
    .

---
Environment for perl v5.6.0:
    HOME (unset)
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=E:\Perl\bin\;E:\WINNT\system32;E:\WINNT;E:\WINNT\System32\Wbem;E:\PROGRA~1\ULTRAE~1
    PERL_BADLANG (unset)
    SHELL (unset)

• [ID 20010331.003] No warning under -w for use of push/unshiftcalled with just ARRAY and ommittance of EXPR by Jos I Boumans