From frank.wiegand@gmail.com

This is a bug report for perl from frank.wiegand@gmail.com,
generated with the help of perlbug 1.39 running under perl 5.12.0.

% perl-5.10.1 -E 'when(scalar){}'
Not enough arguments for scalar at -e line 1, near "scalar)"
Execution of -e aborted due to compilation errors.

% perl-5.12.0-RC3 -E 'when(scalar){}'
perl-5.12.0-RC3: op.c:5272: S_looks_like_bool: Assertion `o' failed.
Aborted

This regression has been introduced by the following commit (as git
bisect says):

5341b2b is the first bad commit
commit 5341b2b
Author: Josh ben Jore <jjore@cpan.org>
Date: Wed Sep 23 15:35:14 2009 -0700

Fix when( scalar ... ) bug

looks_like_bool should look past scalar(). Prior to this fix, saying
scalar() caused the when() argument to be /not/ a boolean even if it
reasonably was. Perhaps something like: when( scalar /$re/ ). I don't
know any natural way someone is doing to use when(scalar ...) but it
certainly seems like it was mistakenly left out.

:100644 100644 729c25f0aa87bcd25f8606bd70d852c6c67e1967 c3736fac0b76b2e4beaf755d5a628d4d71e129d3 M op.c
:040000 040000 afe81091570f36d8e50f3513ec91f3f0f27b55f4 03acff2025d490e42f74d28599f1df3994becef1 M t

Thanks, Frank

Flags:
category=core
severity=low

Site configuration information for perl 5.12.0:

Configured by fw at Sat Apr 3 09:18:00 CEST 2010.

Summary of my perl5 (revision 5 version 12 subversion 0) configuration:

Platform:
osname=linux, osvers=2.6.32-trunk-amd64, archname=x86_64-linux
uname='linux hal2 2.6.32-trunk-amd64 #1 smp sun jan 10 22:40:40 utc 2010 x86_64 gnulinux '
config_args='-de -Dusedevel -DDEBUGGING=both -Doptimize=-g -Dcc=ccache gcc -Dld=gcc -Dprefix=/opt/perl/perl-5.12.0-RC3/ -Dmad'
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='ccache gcc', ccflags ='-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-g',
cppflags='-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.4.3 20100108 (prerelease)', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='gcc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
libc=/lib/libc-2.10.2.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.10.2'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -g -L/usr/local/lib -fstack-protector'

Locally applied patches:
RC3

@INC for perl 5.12.0:
/opt/perl/perl-5.12.0-RC3/lib/site_perl/5.12.0/x86_64-linux
/opt/perl/perl-5.12.0-RC3/lib/site_perl/5.12.0
/opt/perl/perl-5.12.0-RC3/lib/5.12.0/x86_64-linux
/opt/perl/perl-5.12.0-RC3/lib/5.12.0
.

Environment for perl 5.12.0:
HOME=/home/fw
LANG=de_DE.UTF-8
LANGUAGE=
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/sbin:/usr/sbin:/home/fw/bin:/home/fw/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
PERL_AUTOINSTALL=--defaultdeps
PERL_BADLANG (unset)
PERL_EXTUTILS_AUTOINSTALL=--defaultdeps
PERL_MM_USE_DEFAULT=1
SHELL=/bin/zsh

when(scalar){} -> S_looks_like_bool: Assertion `o' failed. #10287

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