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Report information
Id: 132397
Status: new
Priority: 0/
Queue: perl5

Owner: Nobody
Requestors: zefram [at] fysh.org
Cc:
AdminCc:

Operating System: (no value)
PatchStatus: (no value)
Severity: low
Type: library
Perl Version: 5.27.5
Fixed In: (no value)



To: perlbug [...] perl.org
CC: zefram [...] fysh.org
Date: Sat, 04 Nov 2017 23:42:23 +0000
From: zefram [...] fysh.org
Subject: Deparse -x3 loses "for" initialiser
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This is a bug report for perl from zefram@fysh.org, generated with the help of perlbug 1.40 running under perl 5.27.5. ----------------------------------------------------------------- [Please describe your issue here] If B::Deparse is given the "-x3" option to expand source constructs, its expansion of "for" loops loses the initialisation part entirely: $ perl -MO=Deparse -e 'for($i = 5; $i != 10; $i++) { print $i, "\n"; }' for ($i = 5; $i != 10; ++$i) { print $i, "\n"; } -e syntax OK $ perl -MO=Deparse,-x3 -e 'for($i = 5; $i != 10; $i++) { print $i, "\n"; }' while ($i != 10) { print $i, "\n"; } continue { ++$i } -e syntax OK The documentation for B::Deparse has a warning about variables declared in the initialiser getting the wrong scope, but that's not what's happening here. The declaration doesn't get the wrong scope: it's omitted entirely, and (as shown above) the omission happens even without a declaration. [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=library severity=low module=B::Deparse --- Site configuration information for perl 5.27.5: Configured by zefram at Fri Oct 20 23:24:00 BST 2017. Summary of my perl5 (revision 5 version 27 subversion 5) configuration: Platform: osname=linux osvers=3.16.0-4-amd64 archname=x86_64-linux-thread-multi uname='linux barba.rous.org 3.16.0-4-amd64 #1 smp debian 3.16.43-2+deb8u2 (2017-06-26) x86_64 gnulinux ' config_args='-des -Dprefix=/home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52 -Duselargefiles -Dusethreads -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dusedevel -Uversiononly -Ui_db' 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='cc' ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2' optimize='-O2' cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include' ccversion='' gccversion='4.9.2' 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='cc' ldflags =' -fstack-protector-strong -L/usr/local/lib' libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib libs=-lpthread -lnsl -ldb -ldl -lm -lcrypt -lutil -lc perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc libc=libc-2.19.so so=so useshrplib=true libperl=libperl.so gnulibc_version='2.19' Dynamic Linking: dlsrc=dl_dlopen.xs dlext=so d_dlsymun=undef ccdlflags='-Wl,-E -Wl,-rpath,/home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/5.27.5/x86_64-linux-thread-multi/CORE' cccdlflags='-fPIC' lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong' --- @INC for perl 5.27.5: /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/site_perl/5.27.5/x86_64-linux-thread-multi /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/site_perl/5.27.5 /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/5.27.5/x86_64-linux-thread-multi /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/5.27.5 --- Environment for perl 5.27.5: HOME=/home/zefram LANG (unset) LANGUAGE (unset) LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/bin:/home/zefram/usr/perl/util:/home/zefram/pub/x86_64-unknown-linux-gnu/bin:/home/zefram/pub/common/bin:/usr/bin:/bin:/usr/local/bin:/usr/games PERLDOC=-oman PERL_BADLANG (unset) SHELL=/usr/bin/zsh


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