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[perl #22231] <$foo> is parsed as glob(' ' . $foo) if Switch.pm is used

From:
Michael Fowler
Date:
May 17, 2003 17:58
Subject:
[perl #22231] <$foo> is parsed as glob(' ' . $foo) if Switch.pm is used
Message ID:
rt-22231-57784.9.27978655304244@bugs6.perl.org
# New Ticket Created by  Michael Fowler 
# Please include the string:  [perl #22231]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=22231 >



This is a bug report for perl from michael@shoebox.net,
generated with the help of perlbug 1.34 running under perl v5.8.0.


-----------------------------------------------------------------
[Please enter your report here]


The following code:

    #!/usr/bin/perl

    use Switch;
    #switch

    open(my $foo, "<&STDIN") || die;
    print <$foo> . "\n";

prints:

    GLOB(0x811f354)

If the use Switch line is commented out it prints whatever is passed on
STDIN, as expected.  Using B::Deparse confirms the last line is being parsed
as:

    print glob(' ', $foo) . "\n";

with the use Switch uncommented.  The commented out switch statement is
required; Switch apparently must find "switch" in the code somewhere for the
problem to be triggered.


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.8.0:

Configured by michael at Tue Dec 17 01:34:48 AKST 2002.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.2.19, archname=i586-linux
    uname='linux beowulf 2.2.19 #1 wed aug 22 19:47:49 akdt 2001 i586 unknown '
    config_args=''
    hint=previous, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3',
    cppflags='-fno-strict-aliasing -I/usr/local/include -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    ccversion='', gccversion='2.95.4 20011002 (Debian prerelease)', 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=-lnsl -lgdbm -ldbm -ldb -ldl -lm -lc -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lc -lcrypt -lutil
    libc=/lib/libc-2.2.5.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.0:
    /home/michael/perl5lib
    /home/michael/code/libs/perl
    /home/michael/perl/5.8.0/normal/lib/i586-linux
    /home/michael/perl/5.8.0/normal/lib
    /home/michael/perl/5.8.0/normal/site_perl/i586-linux
    /home/michael/perl/5.8.0/normal/site_perl
    /home/michael/perl/5.8.0/normal/site_perl
    .

---
Environment for perl v5.8.0:
    HOME=/home/michael
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/michael/bin:/var/mp3/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/sbin:/usr/sbin:/usr/bin/X11:/usr/lib/postgresql/bin:/usr/local/games:/usr/games:.
    PERL5LIB=/home/michael/perl5lib:/home/michael/code/libs/perl
    PERL_BADLANG (unset)
    SHELL=/bin/bash




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