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Postings from April 2018
Hi Linda, Whether there are situations that are unambiguous for the compiler or not, there are additional reasons to removing auto deref. This includes ambiguity for the developers as well - and even if that is arguable, the confusion for the developer isn't. Providing an auto deref for some operations but not others is far worse than supporting it in full. I think this ticket should be respectfully rejected. On 04/14/2018 01:31 AM, Linda Walsh (via RT) wrote: > # New Ticket Created by Linda Walsh > # Please include the string: [perl #133109] > # in the subject line of all future correspondence about this issue. > # <URL: https://rt.perl.org/Ticket/Display.html?id=133109 > > > > > This is a bug report for perl from perl-diddler@tlinx.org, > generated with the help of perlbug 1.40 running under perl 5.26.1. > > > ----------------------------------------------------------------- > [Please describe your issue here] > > If a scaler is null or an ARRAY ref, why shouldn't perl be > able to treat it as one in a context where a non-ARRAY ref would generate > an error? > > ex: > my $aref; > push $aref, 1; > > I'm aware an alternate way to do this was added, but perl, like many > languages often has multiple ways to do something. More so in > perl in that a major feature in perl is autovivification. > > This is a perfect example of perl autovivifying an array > ref to use as an array needed by push. So why would it be > "forbidden". > > Even more curious is that perl is a permissive language. If you > want to do something it will usually let you -- assuming that > the user is in a position to better know what is wanted/needed > in a specific circumstance. I remember a discussion of > perl's OO design and how perl doesn't enforce class boundaries > or the concept of 'private', by _default_. While extensions > can can add such things, nothing is forbidden. So why would > something that used to work be made "forbidden"? > > Can perl be allowed to do the right thing when perl already knows > what it is? > > Thanks, > > > [Please do not change anything below this line] > ----------------------------------------------------------------- > --- > Flags: > category=core > severity=high > --- > Site configuration information for perl 5.26.1: > > Configured by ASSI at Tue Sep 26 18:50:45 CEST 2017. > > Summary of my perl5 (revision 5 version 26 subversion 1) configuration: > > Platform: > osname=cygwin > osvers=2.9.0(0.31853) > archname=x86_64-cygwin-threads-multi > uname='cygwin_nt-6.3 cygwin 2.9.0(0.31853) 2017-09-12 10:18 x86_64 cygwin ' > config_args='-des -Dprefix=/usr -Dmksymlinks -Darchname=x86_64-cygwin-threads -Dlibperl=cygperl5_26.dll -Dcc=gcc -Dld=g++ -Accflags=-ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.26.1-1 -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.26.1=/usr/src/debug/perl-5.26.1-1 -fwrapv' > hint=recommended > useposix=true > d_sigaction=define > useithreads=define > usemultiplicity=define > use64bitint=define > use64bitall=define > uselongdouble=undef > usemymalloc=n > default_inc_excludes_dot=define > bincompat5005=undef > Compiler: > cc='gcc' > ccflags ='-DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.26.1-1 -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.26.1=/usr/src/debug/perl-5.26.1-1 -fwrapv -fno-strict-aliasing -fstack-protector-strong -D_FORTIFY_SOURCE=2' > optimize='-O3' > cppflags='-DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.26.1-1 -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.26.1=/usr/src/debug/perl-5.26.1-1 -fwrapv -fno-strict-aliasing -fstack-protector-strong' > ccversion='' > gccversion='6.4.0' > gccosandvers='' > intsize=4 > longsize=8 > ptrsize=8 > doublesize=8 > byteorder=12345678 > doublekind=3 > d_longlong=define > longlongsize=8 > d_longdbl=define > longdblsize=16 > longdblkind=3 > ivtype='long' > ivsize=8 > nvtype='double' > nvsize=8 > Off_t='off_t' > lseeksize=8 > alignbytes=8 > prototype=define > Linker and Libraries: > ld='g++' > ldflags =' -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong' > libpth=/usr/lib > libs=-lpthread -lgdbm -ldb -ldl -lcrypt -lgdbm_compat > perllibs=-lpthread -ldl -lcrypt > libc=/usr/lib/libcygwin.a > so=dll > useshrplib=true > libperl=cygperl5_26.dll > gnulibc_version='' > Dynamic Linking: > dlsrc=dl_dlopen.xs > dlext=dll > d_dlsymun=undef > ccdlflags=' ' > cccdlflags=' ' > lddlflags=' --shared -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong' > > Locally applied patches: > Cygwin: README > Cygwin: use auto-image-base instead of fixed DLL base address > Cygwin: modify hints > Cygwin: Configure correct libsearch > Cygwin: Configure correct libpth > Cygwin: Win32 correct UTF8 handling > Perl: File-Path-2.14 (fixes CVE2017-6512) > > --- > @INC for perl 5.26.1: > /usr/local/lib/perl5/site_perl/5.26/x86_64-cygwin-threads > /usr/local/share/perl5/site_perl/5.26 > /usr/lib/perl5/vendor_perl/5.26/x86_64-cygwin-threads > /usr/share/perl5/vendor_perl/5.26 > /usr/lib/perl5/5.26/x86_64-cygwin-threads > /usr/share/perl5/5.26 > > --- > Environment for perl 5.26.1: > CYGWIN=system nodosfilewarning winsymlinks:native export > HOME=/Users/l.B > LANG (unset) > LANGUAGE (unset) > LC_COLLATE=C > LC_CTYPE=en_US.UTF-8 > LC_MESSAGES=C > LC_MONETARY=C > LC_NUMERIC=C > LC_TIME=C > LD_LIBRARY_PATH (unset) > LOGDIR (unset) > PATH=.:.:/usr/bin:/sbin:/prog64/vim/current:/Prog64/VanDyke Software/SecureCRT:/Prog/Sysinternals/cmd:/Prog/Sysinternals:/Prog/Common Files/DivX Shared:/Prog/QuickTime:/Prog/QuickTime/QTSystem:/Prog/NVIDIA Corporation/PhysX/Common:/Prog64/Razer Chroma SDK/bin:/Prog/Razer Chroma SDK/bin:/Windows/system32:/Windows:/Windows/System32/Wbem:/Prog64/Process Lasso:/usr/sbin:/Users/l.B/bin:/Users/l.B/bin/lib:/usr/local/bin:/bin:/etc/local/func_lib > PERL_BADLANG (unset) > SHELL=C:/Bin/Bash.exe >Thread Previous | Thread Next