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[perl #132580] aliased references are not visible in enclosedlexical sub

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From:
Diab Jerius
Date:
December 13, 2017 22:34
Subject:
[perl #132580] aliased references are not visible in enclosedlexical sub
Message ID:
rt-4.0.24-24042-1513204477-1540.132580-75-0@perl.org
# New Ticket Created by  Diab Jerius 
# Please include the string:  [perl #132580]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=132580 >



This is a bug report for perl from djerius@cpan.org,
generated with the help of perlbug 1.40 running under perl 5.26.1.


-----------------------------------------------------------------
[Please describe your issue here]

A reference alias is not visible in a lexical subroutine defined
in the same scope.

Here's some sample code:

use 5.010;

use strict;
use warnings;

use feature 'refaliasing';
use feature 'lexical_subs';
use Data::Dumper;

sub foo {
    \my @a = [ 1, 2, 3, 4 ];
    say Dumper \@a;

    # this works as expected
    sub  { say Dumper \@a  }->();

    # this doesn't work as expected
    my sub foo2 { say Dumper \@a  };
    foo2;
}

foo;

And the output:

Aliasing via reference is experimental at tt.pl line 11.
$VAR1 = [
	  1,
	  2,
	  3,
	  4
	];

$VAR1 = [
	  1,
	  2,
	  3,
	  4
	];

$VAR1 = [];


Thanks!
Diab


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl 5.26.1:

Configured by dj at Mon Sep 25 11:01:28 EDT 2017.

Summary of my perl5 (revision 5 version 26 subversion 1) configuration:
   
  Platform:
    osname=linux
    osvers=4.9.0-3-amd64
    archname=x86_64-linux
    uname='linux macabre 4.9.0-3-amd64 #1 smp debian 4.9.30-2+deb9u3 (2017-08-06) x86_64 gnulinux '
    config_args='-Dprefix=/home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9 -de -Dusedevel -A'eval:scriptdir=/home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9/bin''
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='cc'
    ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2'
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='6.3.0 20170516'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/6/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
    libs=-lpthread -lnsl -lgdbm -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.24.so
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.24'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'

Locally applied patches:
    Devel::PatchPerl 1.40

---
@INC for perl 5.26.1:
    /proj/axaf/simul/lib/perl5
    /home/dj/lib/perl5
    /home/dj/research/lib/perl5
    /home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9/lib/perl5/site_perl/5.26.1/x86_64-linux
    /home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9/lib/perl5/site_perl/5.26.1
    /home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9/lib/perl5/5.26.1/x86_64-linux
    /home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9/lib/perl5/5.26.1

---
Environment for perl 5.26.1:
    HOME=/home/dj
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/soft/SYBASE15.7/DataAccess64/ODBC/lib:/soft/SYBASE15.7/DataAccess/ODBC/lib:/soft/SYBASE15.7/OCS-15_0/lib:/soft/SYBASE15.7/OCS-15_0/lib3p64:/soft/SYBASE15.7/OCS-15_0/lib3p:
    LOGDIR (unset)
    PATH=/home/dj/.plenv/versions/5.26.1-x86_64-linux_debian-9/bin:/home/dj/.plenv/libexec:/home/dj/.plenv/plugins/link-axaf/bin:/home/dj/.plenv/plugins/perl-build/bin:/home/dj/.plenv/plugins/plenv-contrib/bin:/soft/SYBASE15.7/OCS-15_0/bin:/home/dj/.rbenv/shims:/home/dj/.rbenv/bin:/home/dj/.pyenv/plugins/pyenv-virtualenv/shims:/home/dj/.pyenv/shims:/home/dj/.pyenv/bin:/home/dj/.plenv/shims:/home/dj/.plenv/bin:/home/dj/root/bin:/home/dj/root/bin/hosts:/home/dj/research/bin:/proj/axaf/ots/pkgs/perl-5.22/x86_64-linux_debian-9/bin:/proj/axaf/bin:/proj/axaf/simul/bin:/proj/axaf/simul/x86_64-linux_debian-9/bin:/proj/axaf/ots/x86_64-linux_debian-9/bin:/proj/axaf/ots/bin:/usr/local/bin:/usr/sbin:/bin:/usr/bin:/soft/saord/bin
    PERL5LIB=/proj/axaf/simul/lib/perl5:/home/dj/lib/perl5:/home/dj/research/lib/perl5
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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