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unary minus on barewords not constant folded #14970

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p5pRT opened this issue Oct 8, 2015 · 5 comments
Closed

unary minus on barewords not constant folded #14970

p5pRT opened this issue Oct 8, 2015 · 5 comments
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distro-Linux type-core

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@p5pRT
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p5pRT commented Oct 8, 2015

Migrated from rt.perl.org#126305 (status was 'resolved')

Searchable as RT126305$
@p5pRT
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p5pRT commented Oct 8, 2015

From @mauke

Created by @mauke

$ perl -MO=Deparse -e 'sub { -"foo" => 1 }'
sub {
  '-foo', 1;
}
;
-e syntax OK

$ perl -MO=Deparse -e 'sub { -foo => 1 }'
sub {
  -'foo', 1;
}
;
-e syntax OK

As you can see, -"foo" gets constant folded to "-foo". But unary minus on a
bareword (autoquoted) is delayed until runtime (at least according to
B​::Deparse).

Shouldn't they work the same?

Perl Info 

Flags:
    category=core
    severity=low

Site configuration information for perl 5.22.0:

Configured by mauke at Sat Jul  4 14:56:57 CEST 2015.

Summary of my perl5 (revision 5 version 22 subversion 0) configuration:
   
  Platform:
    osname=linux, osvers=4.0.1-1-arch, archname=i686-linux
    uname='linux simplicio 4.0.1-1-arch #1 smp preempt wed apr 29 12:15:20 cest 2015 i686 gnulinux '
    config_args=''
    hint=recommended, 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 -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='5.1.0', 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 -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/i686-pc-linux-gnu/5.1.0/include-fixed /usr/lib /lib
    libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.21.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.21'
  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'



@INC for perl 5.22.0:
    /home/mauke/usr/lib/perl5/site_perl/5.22.0/i686-linux
    /home/mauke/usr/lib/perl5/site_perl/5.22.0
    /home/mauke/usr/lib/perl5/5.22.0/i686-linux
    /home/mauke/usr/lib/perl5/5.22.0
    .


Environment for perl 5.22.0:
    HOME=/home/mauke
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_COLLATE=POSIX
    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=0.69
    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 Nov 12, 2016

From @mauke

On Thu, 08 Oct 2015 14​:54​:34 -0700, mauke- wrote​:

$ perl -MO=Deparse -e 'sub { -"foo" => 1 }'
sub {
'-foo', 1;
}
;
-e syntax OK

$ perl -MO=Deparse -e 'sub { -foo => 1 }'
sub {
-'foo', 1;
}
;
-e syntax OK

As you can see, -"foo" gets constant folded to "-foo". But unary minus
on a
bareword (autoquoted) is delayed until runtime (at least according to
B​::Deparse).

This was patched in 2e6807b.

@p5pRT
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p5pRT commented Nov 12, 2016

@mauke - Status changed from 'new' 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'

@p5pRT p5pRT closed this as completed May 30, 2017
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