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[perl #43082] "$_[0]->method" interpolation
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From:
webmasters @ ctosonline . org
Date:
May 31, 2007 04:34
Subject:
[perl #43082] "$_[0]->method" interpolation
Message ID:
rt-3.6.HEAD-1668-1180574570-443.43082-75-0@perl.org
# New Ticket Created by webmasters@ctosonline.org
# Please include the string: [perl #43082]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=43082 >
With "$_->method", $_ is interpolated, but '->method' is taken
literally. However, if I put a subscript after the variable, I get a
syntax error:
$ perl5.9.5 -le '$_[0] = "main"; print "$_[0]->method"'
syntax error at -e line 1, at EOF
Execution of -e aborted due to compilation errors.
If I change "$_[0]->method" to "$_[0]\->method", it prints 'main-
>method', as I would expect the former to do as well. perlop says
that methods calls such as "$obj->method" do not interpolate, but
says nothing about "$_[0]->method" (with a subscript) being a syntax
error.
Is this a bug? If not, could the error messages be changed in the
following cases?
$ perl
{ "$_[0]->method"
}
^D
Unmatched right curly bracket at - line 2, within string
syntax error at - line 2, near "}"
Missing right curly or square bracket at - line 1, at end of line
Execution of - aborted due to compilation errors.
$ perl
"$_[0]->method'"
^D
String found where operator expected at - line 1, within string
(Missing semicolon on previous line?)
Can't find string terminator "'" anywhere before EOF at - line 1.
$ perl -e'"$_[0]->method =~ /"'
Search pattern not terminated at -e line 1.
etc.
I hope this report helps.
Father Chrysostomos
---
Flags:
category=core
severity=low
---
Site configuration information for perl 5.9.5:
Configured by neo at Tue May 15 14:11:42 PDT 2007.
Summary of my perl5 (revision 5 version 9 subversion 5 patch 31224)
configuration:
Platform:
osname=darwin, osvers=8.8.0, archname=darwin-2level
uname='darwin treebeard.local 8.8.0 darwin kernel version 8.8.0:
fri sep 8 17:18:57 pdt 2006; root:xnu-792.12.6.obj~1release_ppc power
macintosh powerpc '
config_args='-de -Dusedevel'
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
useperlio=define, d_sfio=undef, uselargefiles=define,
usesocks=undef
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-fno-common -DPERL_DARWIN -no-cpp-precomp -
fno-strict-aliasing -pipe -I/usr/local/include',
optimize='-O3',
cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp-
precomp -fno-strict-aliasing -pipe -I/usr/local/include'
ccversion='', gccversion='4.0.0 20041026 (Apple Computer, Inc.
build 4061)', gccosandvers='darwin8'
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=4321
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=4, nvtype='double', nvsize=8,
Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -L/usr/
local/lib'
libpth=/usr/local/lib /usr/lib
libs=-ldbm -ldl -lm -lc
perllibs=-ldl -lm -lc
libc=/usr/lib/libc.dylib, so=dylib, useshrplib=false,
libperl=libperl.a
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/
usr/local/lib'
Locally applied patches:
DEVEL
---
@INC for perl 5.9.5:
/usr/local/lib/perl5/5.9.5/darwin-2level
/usr/local/lib/perl5/5.9.5
/usr/local/lib/perl5/site_perl/5.9.5/darwin-2level
/usr/local/lib/perl5/site_perl/5.9.5
/usr/local/lib/perl5/site_perl
.
---
Environment for perl 5.9.5:
DYLD_LIBRARY_PATH (unset)
HOME=/Users/neo
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/TeX/bin/powerpc-
darwin6.8:/usr/local/bin
PERL_BADLANG (unset)
SHELL=/bin/bash
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