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"Use of uninitialized value $fh" mentions wrong variable #15516

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p5pRT opened this issue Aug 15, 2016 · 6 comments
Closed

"Use of uninitialized value $fh" mentions wrong variable #15516

p5pRT opened this issue Aug 15, 2016 · 6 comments

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@p5pRT
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p5pRT commented Aug 15, 2016

Migrated from rt.perl.org#128940 (status was 'resolved')

Searchable as RT128940$

@p5pRT
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p5pRT commented Aug 15, 2016

From @mauke

Created by @mauke

$ perl -we 'print "" . open my $fh, "<", "no / such / file"'
Use of uninitialized value $fh in concatenation (.) or string at -e line 1.
  ^^^

The uninitialized value is the result of the open call, not $fh. $fh isn't
concatenated (and it isn't undef either; open sets it to \*{'main​::$fh}').
So $fh shouldn't appear in the error message.

Perl Info

Flags:
    category=core
    severity=low

Site configuration information for perl 5.24.0:

Configured by mauke at Mon May  9 21:21:33 CEST 2016.

Summary of my perl5 (revision 5 version 24 subversion 0) configuration:
   
  Platform:
    osname=linux, osvers=4.4.5-1-arch, archname=i686-linux
    uname='linux simplicio 4.4.5-1-arch #1 smp preempt thu mar 10 07:54:30 cet 2016 i686 gnulinux '
    config_args=''
    hint=previous, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, 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',
    optimize='-O2 -flto',
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion='', gccversion='6.1.1 20160501', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234, doublekind=3
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12, longdblkind=3
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-fstack-protector-strong -L/usr/local/lib -flto'
    libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/6.1.1/include-fixed /usr/lib /lib /usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/6.1.1/include-fixed /usr/lib
    libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.23.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.23'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -flto -L/usr/local/lib -fstack-protector-strong'



@INC for perl 5.24.0:
    /home/mauke/usr/lib/perl5/site_perl/5.24.0/i686-linux
    /home/mauke/usr/lib/perl5/site_perl/5.24.0
    /home/mauke/usr/lib/perl5/5.24.0/i686-linux
    /home/mauke/usr/lib/perl5/5.24.0
    .


Environment for perl 5.24.0:
    HOME=/home/mauke
    LANG=en_US.UTF-8
    LANGUAGE=en_US
    LC_COLLATE=C
    LC_MONETARY=de_DE.UTF-8
    LC_TIME=de_DE.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/mauke/perl5/perlbrew/bin:/home/mauke/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
    PERLBREW_BASHRC_VERSION=0.73
    PERLBREW_HOME=/home/mauke/.perlbrew
    PERLBREW_ROOT=/home/mauke/perl5/perlbrew
    PERL_BADLANG (unset)
    PERL_UNICODE=SAL
    SHELL=/bin/bash

@p5pRT
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p5pRT commented Aug 15, 2016

From @iabyn

On Mon, Aug 15, 2016 at 01​:19​:15AM -0700, l.mai@​web.de wrote​:

$ perl -we 'print "" . open my $fh, "<", "no / such / file"'
Use of uninitialized value $fh in concatenation (.) or string at -e line 1.
^^^

The uninitialized value is the result of the open call, not $fh. $fh isn't
concatenated (and it isn't undef either; open sets it to \*{'main​::$fh}').
So $fh shouldn't appear in the error message.

Now fixed in blead with v5.25.3-249-g6b57d4b

--
You're only as old as you look.

@p5pRT
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p5pRT commented Aug 15, 2016

The RT System itself - Status changed from 'new' to 'open'

@p5pRT
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p5pRT commented Aug 15, 2016

@iabyn - Status changed from 'open' to 'pending release'

@p5pRT
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p5pRT commented May 30, 2017

From @khwilliamson

Thank you for filing this report. You have helped make Perl better.

With the release today of Perl 5.26.0, this and 210 other issues have been
resolved.

Perl 5.26.0 may be downloaded via​:
https://metacpan.org/release/XSAWYERX/perl-5.26.0

If you find that the problem persists, feel free to reopen this ticket.

@p5pRT
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p5pRT commented May 30, 2017

@khwilliamson - Status changed from 'pending release' to 'resolved'

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