[perl #113728] Additional lint-type warning?

# New Ticket Created by  Darin McBride 
# Please include the string:  [perl #113728]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=113728 >



This is a bug report for perl from dmcbride@cpan.org,
generated with the help of perlbug 1.39 running under perl 5.16.0.


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

$ perl5.16.0 -Mstrict -Mwarnings -E 'if (@ARGV) { say for -foo => "blah" -baz => "bar" }'
$ perl5.16.0 -Mstrict -Mwarnings -E 'if (@ARGV) { say for -foo => "blah" -baz => "bar" }' 1
Argument "baz" isn't numeric in subtraction (-) at -e line 1.
Argument "blah" isn't numeric in subtraction (-) at -e line 1.
-foo
0
bar

There's a typo in the code.  The comma separating C<"blah"> and C<-baz> is
missing.  Unfortunately, this becomes a runtime warning instead of a compile-
time warning.  In general, this might be hard to notice, but when both
arguments to a numeric binary operator are constant strings, perhaps a bit
of lint-style warnings during compilation would be possible?

"How far do we go on this?"  Depends on how far the optimiser goes.

sub FOO() { 'msg' }

if ($usually_false) {
  log_error(
    -error => "my error"
    -FOO   => $message
  )
}

Can this be caught?  It probably gets more tricky when we start to get
in to other scenarios, and that's fine - catching a few more errors a bit
sooner is better than not.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=library
    severity=wishlist
    module=warnings
---
Site configuration information for perl 5.16.0:

Configured by nobody at Wed Jun 13 14:08:00 MDT 2012.

Summary of my perl5 (revision 5 version 16 subversion 0) configuration:
   
  Platform:
    osname=linux, osvers=3.2.12-gentoo, archname=x86_64-linux-thread-multi
    uname='linux naboo 3.2.12-gentoo #2 smp sun jun 3 01:06:44 mdt 2012 x86_64 intel(r) core(tm) i7 cpu 930 @ 2.80ghz genuineintel gnulinux '
    config_args='-desr -Duse64bitall -Dusethreads -Dprefix=/opt/myperl/5.16.0'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector'
    ccversion='', gccversion='4.5.3', 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='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /lib/../lib64 /usr/lib/../lib64 /lib /usr/lib /lib64 /usr/lib64 /usr/local/lib64
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/libc-2.14.1.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.14.1'
  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'

Locally applied patches:
    

---
@INC for perl 5.16.0:
    /opt/myperl/5.16.0/lib/site_perl/5.16.0/x86_64-linux-thread-multi
    /opt/myperl/5.16.0/lib/site_perl/5.16.0
    /opt/myperl/5.16.0/lib/5.16.0/x86_64-linux-thread-multi
    /opt/myperl/5.16.0/lib/5.16.0
    .

---
Environment for perl 5.16.0:
    HOME=/home/dmcbride
    LANG=en_US.utf8
    LANGUAGE=
    LC_ALL=en_US.utf8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/dmcbride/bin:/usr/lib/distcc/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.5.3:/usr/x86_64-pc-linux-gnu/i686-pc-linux-gnu/gcc-bin/4.5.3:/share/cvs/bin:/usr/local/bin:/usr/games/bin:/share/bin:/share/darin/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #113728] Additional lint-type warning? by Father Chrysostomos via RT
• [perl #113728] Additional lint-type warning? by Darin McBride