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local() doesn't restore variable's pos() #5344

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p5pRT opened this issue Apr 21, 2002 · 2 comments
Closed

local() doesn't restore variable's pos() #5344

p5pRT opened this issue Apr 21, 2002 · 2 comments
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distro-Linux type-core

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@p5pRT
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p5pRT commented Apr 21, 2002

Migrated from rt.perl.org#8971 (status was 'resolved')

Searchable as RT8971$
@p5pRT
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p5pRT commented Apr 21, 2002

From jefpin@towers.par64.org

Created by jefpin@towers.par64.org

Simply put, if you set pos($x), then local()ize $x, when you go back to
the original scope, pos($x) is undef.

  $x = "japhy";
  pos($x) = 2;
  print pos($x), "\n";
  { local $x; }
  print pos($x), "\n";
  __END__
  2

With warnings on, I'm yelled at for printing undef on line 5.

Perl Info 

Flags:
    category=core
    severity=medium

Site configuration information for perl v5.7.3:

Configured by jefpin at Fri Apr 19 21:49:06 EDT 2002.

Summary of my perl5 (revision 5.0 version 7 subversion 3 patch 16011) configuration:
  Platform:
    osname=linux, osvers=2.2.16-3, archname=i586-linux
    uname='linux towers.par64.org 2.2.16-3 #5 sat jul 8 11:42:18 edt 2000 i586 unknown '
    config_args='-DDEBUGGING -Dusedevel -Dprefix=/home/jefpin/bleadperl -de'
    hint=recommended, 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=define
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -I/usr/include/gdbm'
    ccversion='', gccversion='egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)', 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 -lndbm -lgdbm -ldb -ldl -lm -lc -lposix -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lc -lposix -lcrypt -lutil
    libc=/lib/libc-2.1.3.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    DEVEL16004


@INC for perl v5.7.3:
    /home/jefpin/bleadperl/lib/5.7.3/i586-linux
    /home/jefpin/bleadperl/lib/5.7.3
    /home/jefpin/bleadperl/lib/site_perl/5.7.3/i586-linux
    /home/jefpin/bleadperl/lib/site_perl/5.7.3
    /home/jefpin/bleadperl/lib/site_perl
    .


Environment for perl v5.7.3:
    HOME=/home/jefpin
    LANG=en_US
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/bin:/bin:/usr/local/bin:/usr/X11R6/bin:/home/jefpin/bin:/tmp/bleadperl/bin
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh

@p5pRT
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p5pRT commented Apr 21, 2002

From @vanstyn

Jeff Pinyan <jefpin@​towers.par64.org> wrote​:
:Simply put, if you set pos($x), then local()ize $x, when you go back to
:the original scope, pos($x) is undef.
:
: $x = "japhy";
: pos($x) = 2;
: print pos($x), "\n";
: { local $x; }
: print pos($x), "\n";
: __END__

This is a known problem; please check archives for references to
locali[sz]ation of magic.

Hugo

@p5pRT p5pRT closed this as completed Nov 28, 2003
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