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sort CONSTANT exhibits weird behavior #7979

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p5pRT opened this issue Jun 19, 2005 · 4 comments
Open

sort CONSTANT exhibits weird behavior #7979

p5pRT opened this issue Jun 19, 2005 · 4 comments
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distro-Linux type-core

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@p5pRT
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p5pRT commented Jun 19, 2005

Migrated from rt.perl.org#36333 (status was 'open')

Searchable as RT36333$
@p5pRT
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p5pRT commented Jun 19, 2005

From @fbriere

Created by @fbriere

  $ perl -le 'use constant NUMBERS => qw(one two three); print sort NUMBERS'
  NUMBERS

  $ perl -le 'use constant NUMBERS => qw(one two three); print sort NUMBERS()'

  $ perl -le 'use constant NUMBERS => qw(one two three); print sort (NUMBERS)'
  NUMBERS

  $ perl -le 'use constant NUMBERS => qw(one two three); print sort (NUMBERS())'
  onethreetwo

(I imagine case #2 is related to ticket #30377.)

Perl Info 

Flags:
    category=core
    severity=low

Site configuration information for perl v5.8.7:

Configured by Debian Project at Thu Jun  9 00:28:22 EST 2005.

Summary of my perl5 (revision 5 version 8 subversion 7) configuration:
  Platform:
    osname=linux, osvers=2.4.27-ti1211, archname=i386-linux-thread-multi
    uname='linux kosh 2.4.27-ti1211 #1 sun sep 19 18:17:45 est 2004 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.7 -Dsitearch=/usr/local/lib/perl/5.8.7 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.7 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='3.3.6 (Debian 1:3.3.6-6)', 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=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=true, libperl=libperl.so.5.8.7
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    


@INC for perl v5.8.7:
    /etc/perl
    /usr/local/lib/perl/5.8.7
    /usr/local/share/perl/5.8.7
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8
    /usr/share/perl/5.8
    /usr/local/lib/site_perl
    /usr/local/share/perl/5.8.0
    .


Environment for perl v5.8.7:
    HOME=/home/fbriere
    LANG=en_CA
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:.
    PERL_BADLANG (unset)
    SHELL=/bin/bash

@p5pRT
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p5pRT commented Jul 8, 2016

From @dcollinsn

dcollins@​nightshade64​:~/toolchain$ perl5.25.2 -MO=Deparse -le 'use constant NUMBERS => qw(one two three); print sort NUMBERS;'
BEGIN { $/ = "\n"; $\ = "\n"; }
use constant ('NUMBERS', ('one', 'two', 'three'));
print sort('NUMBERS');
-e syntax OK
dcollins@​nightshade64​:~/toolchain$ perl5.25.2 -MO=Deparse -le 'use constant NUMBERS => qw(one two three); print sort NUMBERS();'
BEGIN { $/ = "\n"; $\ = "\n"; }
use constant ('NUMBERS', ('one', 'two', 'three'));
print((sort NUMBERS ()));
-e syntax OK
dcollins@​nightshade64​:~/toolchain$ perl5.25.2 -MO=Deparse -le 'use constant NUMBERS => qw(one two three); print sort (NUMBERS);'
BEGIN { $/ = "\n"; $\ = "\n"; }
use constant ('NUMBERS', ('one', 'two', 'three'));
print sort('NUMBERS');
-e syntax OK
dcollins@​nightshade64​:~/toolchain$ perl5.25.2 -MO=Deparse -le 'use constant NUMBERS => qw(one two three); print sort (NUMBERS());'
BEGIN { $/ = "\n"; $\ = "\n"; }
use constant ('NUMBERS', ('one', 'two', 'three'));
print sort(('one', 'two', 'three'));
-e syntax OK

It's being interpreted as a bareword for some reason?

@p5pRT
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p5pRT commented Jul 8, 2016

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

@p5pRT
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p5pRT commented Jul 8, 2016

From @cpansprout

On Thu Jul 07 17​:58​:18 2016, dcollinsn@​gmail.com wrote​:

It's being interpreted as a bareword for some reason?

Oh, what fun! This is a very old bug. And it occurs because of the way that the parser gets to decide whether the first token after ‘sort’ is a comparison sub or part of the list to sort.

The lexer (toke.c) assumes that any word immediately following ‘sort’ is a comparison sub, which gets emitted as a WORD token, just like a bareword.

It is the parser (perly.y) that distinguishes between these two​:

  sort foo bar
  sort foo,bar

So the lexer does not actually know at the time whether the word will be a comparator or not. That makes it hard to fix.

(All of this is from memory. I may be getting some of it wrong.)

use constant{Just=>another=>Perl=>hacker=>};$\=",\n";
print join" ",map eval"sort $_,$_",qw! Just Perl!

--

Father Chrysostomos

@Grinnz Grinnz mentioned this issue Oct 21, 2019
Open
@xenu xenu removed the Severity Low label Dec 29, 2021
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