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[ID 20010118.026] Symbol table aliasing not DWIM'ing except underDebugger

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From:
clintp
Date:
January 18, 2001 12:09
Subject:
[ID 20010118.026] Symbol table aliasing not DWIM'ing except underDebugger
Message ID:
200101182008.PAA14429@budman.backroom
This is a bug report for perl from clintp@budman.backroom,
generated with the help of perlbug 1.28 running under perl v5.6.0.


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

I have a package with a very, very long name and many varibles
that I want to address within the package.  I'd like to alias the
entire namespace.  I recall doing something like this in older
Perls:

$foo::bar::poit::var="hlaghlag";
*g::=\%foo::bar::poit::;   # Alias g:: to some long thing.
print $g::var;             # Should print hlaghlag

Someone else remembered being able to do this as well, so I don't 
think I'm completely senile.   It doesn't work now.  Explantion:

Anyways, in the debugger I can dump g's symbol table and it shows
$var is there.  And I can print $g::var at a debugger prompt, and it's
there.  Actually trying to use $g::var in the body of the program yeilds
undef.

main::(foo.pl:4):       $foo::bar::poit::var="hlag";
  DB<1> n
main::(foo.pl:5):       *g::=\%foo::bar::poit::;
  DB<1> n
main::(foo.pl:6):       print $g::var, "\n";
  DB<1> V g
$var = 'hlag'            # It's there!
  DB<2> print $g::var
hlag                     # No, really!  It's there!
  DB<3> n
            # <--- hlag should have printed, It's gone!
Debugged program terminated.  Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.

This is under perl 5.6 and perl5.005.  At the very least, it's confusing
and not very DWIM'ish.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
This perlbug was built using Perl v5.6.0 - Sat Nov 18 17:53:47 EST 2000
It is being executed now by  Perl v5.6.0 - Sat Sep  9 11:57:58 EDT 2000.

Site configuration information for perl v5.6.0:

Configured by clintp at Sat Sep  9 11:57:58 EDT 2000.

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.2.14-5.0smp, archname=i686-linux
    uname='linux budman 2.2.14-5.0smp #1 smp tue mar 7 21:01:40 est 2000 i686 unknown '
    config_args=''
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
    cppflags='-DDEBUGGING'
    ccflags ='-DDEBUGGING -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    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, usemymalloc=n, 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
    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:
    

---
@INC for perl v5.6.0:
    /usr/local/lib/perl5/5.6.0/i686-linux
    /usr/local/lib/perl5/5.6.0
    /usr/local/lib/perl5/site_perl/5.6.0/i686-linux
    /usr/local/lib/perl5/site_perl/5.6.0
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl v5.6.0:
    HOME=/home/clintp
    LANG=en_US
    LANGUAGE (unset)
    LD_LIBRARY_PATH=:/usr/local/lib
    LOGDIR (unset)
    PATH=/usr/kerberos/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home/clintp/bin:.
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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