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sort CONSTANT exhibits weird behavior #7979

Open p5pRT opened 19 years ago

p5pRT commented 19 years ago

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

Searchable as RT36333$

p5pRT commented 19 years ago

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 commented 8 years ago

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 commented 8 years ago

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

p5pRT commented 8 years ago

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