[ID 20010703.008] PADTMP set, but not READONLY, on non-writeablearg to function

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


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[Please enter your report here]

I don't get told I can't change $_[0] here.  I really think I should.

  sub foo { $_[0] = 1 }
  foo($_ . 'x');

It runs without a hitch.

[Please do not change anything below this line]
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Flags:
    category=core
    severity=medium
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Site configuration information for perl v5.6.0:

Configured by root at Tue Feb  6 18:31:14 EST 2001.

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
  Platform:
    osname=solaris, osvers=2.7, archname=sun4-solaris
    uname='sunos sushi 5.7 generic_106541-14 sun4u sparc sunw,ultra-60 '
    config_args='-Dcc=gcc -Doptimize=-O2'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=undef 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='gcc', optimize='-O2', gccversion=2.95.2 19991024 (release)
    cppflags='-fno-strict-aliasing -I/usr/local/include'
    ccflags ='-fno-strict-aliasing -I/usr/local/include'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -lgdbm -ldb -ldl -lm -lc -lcrypt -lsec
    libc=/lib/libc.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    

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@INC for perl v5.6.0:
    /export/home/jpinyan/lib
    /usr/local/apache/riskgrades/modules
    /export/home/jpinyan/CVS/asset_allocator/modules
    /usr/local/lib/perl5/5.6.0/sun4-solaris
    /usr/local/lib/perl5/5.6.0
    /usr/local/lib/perl5/site_perl/5.6.0/sun4-solaris
    /usr/local/lib/perl5/site_perl/5.6.0
    /usr/local/lib/perl5/site_perl
    .

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Environment for perl v5.6.0:
    HOME=/export/home/jpinyan
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/usr/local/oracle/lib
    LOGDIR (unset)
    PATH=/usr/local/bin:/usr/openwin/bin:/usr/bin:/usr/local/oracle/bin:.:/export/home/jpinyan/bin
    PERL5LIB=/export/home/jpinyan/lib:/usr/local/apache/riskgrades/modules:/export/home/jpinyan/CVS/asset_allocator/modules
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh

• [ID 20010703.008] PADTMP set, but not READONLY, on non-writeablearg to function by jpinyan
• [perl #7226] PADTMP set, but not READONLY, on non-writeable arg to function by Alexandr Ciornii via RT