[perl #121771] Argument "123abc" treated as 0 in increment is actually treated as 123

# New Ticket Created by  Dagfinn Ilmari Mannsåker 
# Please include the string:  [perl #121771]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=121771 >


This is a bug report for perl from ilmari@ilmari.org,
generated with the help of perlbug 1.40 running under perl 5.19.9.


-----------------------------------------------------------------
[Please describe your issue here]

When the argument to ++ starts with a number, but contains trailing
crap, the warning is wrong, since the value is actually treated as the
leading numerical part.

$ perl -wE 'my $x = "123abc"; $x++; say $x'
Argument "123abc" treated as 0 in increment (++) at -e line 1.
124


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl 5.19.9:

Configured by ilmari at Fri Feb 21 14:38:49 GMT 2014.

Summary of my perl5 (revision 5 version 19 subversion 9) configuration:
   
  Platform:
    osname=linux, osvers=3.2.0-58-generic, archname=x86_64-linux
    uname='linux zarquon 3.2.0-58-generic #88-ubuntu smp tue dec 3 17:37:58 utc 2013 x86_64 x86_64 x86_64 gnulinux '
    config_args='-de -Dprefix=/home/ilmari/perl5/perlbrew/perls/19.9 -Dman1dir=none -Dman3dir=none -Dcc=ccache cc -Dusedevel -Aeval:scriptdir=/home/ilmari/perl5/perlbrew/perls/19.9/bin'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='ccache cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.6.3', 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='ccache cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.6/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=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.15'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'


---
@INC for perl 5.19.9:
    /home/ilmari/.perlbrew/libs/19.9@std/lib/perl5/x86_64-linux
    /home/ilmari/.perlbrew/libs/19.9@std/lib/perl5
    /home/ilmari/perl5/perlbrew/perls/19.9/lib/site_perl/5.19.9/x86_64-linux
    /home/ilmari/perl5/perlbrew/perls/19.9/lib/site_perl/5.19.9
    /home/ilmari/perl5/perlbrew/perls/19.9/lib/5.19.9/x86_64-linux
    /home/ilmari/perl5/perlbrew/perls/19.9/lib/5.19.9
    .

---
Environment for perl 5.19.9:
    HOME=/home/ilmari
    LANG=en_GB.UTF-8
    LANGUAGE=en_GB:en
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/ilmari/.perlbrew/libs/19.9@std/bin:/home/ilmari/perl5/perlbrew/bin:/home/ilmari/perl5/perlbrew/perls/19.9/bin:/home/ilmari/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
    PERL5LIB=/home/ilmari/.perlbrew/libs/19.9@std/lib/perl5
    PERLBREW_BASHRC_VERSION=0.64
    PERLBREW_HOME=/home/ilmari/.perlbrew
    PERLBREW_LIB=std
    PERLBREW_MANPATH=/home/ilmari/.perlbrew/libs/19.9@std/man:/home/ilmari/perl5/perlbrew/perls/19.9/man
    PERLBREW_PATH=/home/ilmari/.perlbrew/libs/19.9@std/bin:/home/ilmari/perl5/perlbrew/bin:/home/ilmari/perl5/perlbrew/perls/19.9/bin
    PERLBREW_PERL=19.9
    PERLBREW_ROOT=/home/ilmari/perl5/perlbrew
    PERLBREW_VERSION=0.64
    PERL_BADLANG (unset)
    PERL_LOCAL_LIB_ROOT=/home/ilmari/.perlbrew/libs/19.9@std
    PERL_MB_OPT=--install_base /home/ilmari/.perlbrew/libs/19.9@std
    PERL_MM_OPT=INSTALL_BASE=/home/ilmari/.perlbrew/libs/19.9@std
    SHELL=/bin/bash

-- 
"I use RMS as a guide in the same way that a boat captain would use
 a lighthouse.  It's good to know where it is, but you generally
 don't want to find yourself in the same spot." - Tollef Fog Heen

• [perl #121771] Argument "123abc" treated as 0 in increment is actually treated as 123 by Dagfinn Ilmari Mannsåker
• Re: [perl #121771] Argument "123abc" treated as 0 in increment isactually treated as 123 by Dave Mitchell
• [perl #121771] Argument "123abc" treated as 0 in increment is actually treated as 123 by Tony Cook via RT
• Re: [perl #121771] Argument "123abc" treated as 0 in increment isactually treated as 123 by Nicholas Clark
• Re: [perl #121771] Argument "123abc" treated as 0 in increment is actually treated as 123 by Ed Avis