[perl #121700] Ambiguous use of -foo when it isn't ambiguous

# New Ticket Created by  "Eric Brine" 
# Please include the string:  [perl #121700]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=121700 >



This is a bug report for perl from ikegami@adaelis.com,
generated with the help of perlbug 1.39 running under perl 5.18.0.


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[Please describe your issue here]

$ perl -Mstrict -wE'sub foo { 123 } say -foo;'
Ambiguous use of -foo resolved as -&foo() at -e line 1.
-123

A TERM can't follow a TERM, so the "-" must be a subtraction operator, not the start of a -BAREWORD string literal.

(Bug report submitted using 5.18.0, but the bug is present in blead.)

[Please do not change anything below this line]
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---
Flags:
    category=core
    severity=low
---
Site configuration information for perl 5.18.0:

Configured by ikegami at Sat Jun  1 13:07:24 PDT 2013.

Summary of my perl5 (revision 5 version 18 subversion 0) configuration:
   
  Platform:
    osname=linux, osvers=2.6.32.45-grsec-2.2.2-r3, archname=x86_64-linux-thread-multi
    uname='linux twins 2.6.32.45-grsec-2.2.2-r3 #8 smp mon oct 10 13:33:17 pdt 2011 x86_64 gnulinux '
    config_args='-de -Dprefix=/home/ikegami/usr/perlbrew/perls/5.18.0t -DPERL_SUB_DEPTH_WARN=1000 -Dusethreads -Aeval:scriptdir=/home/ikegami/usr/perlbrew/perls/5.18.0t/bin'
    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 -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.4.5', 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/../lib /usr/lib/../lib /lib /usr/lib /lib64 /usr/lib64
    libs=-lnsl -lgdbm -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/libc-2.11.3.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.11.3'
  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 5.18.0:
    /home/ikegami/usr/perlbrew/perls/5.18.0t/lib/site_perl/5.18.0/x86_64-linux-thread-multi
    /home/ikegami/usr/perlbrew/perls/5.18.0t/lib/site_perl/5.18.0
    /home/ikegami/usr/perlbrew/perls/5.18.0t/lib/5.18.0/x86_64-linux-thread-multi
    /home/ikegami/usr/perlbrew/perls/5.18.0t/lib/5.18.0
    .

---
Environment for perl 5.18.0:
    HOME=/home/ikegami
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_COLLATE=C
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/ikegami/usr/perlbrew/bin:/home/ikegami/usr/perlbrew/perls/5.18.0t/bin:.:/home/ikegami/bin:/home/ikegami/.gems/bin:/usr/lib/ruby/gems/1.8/bin/:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
    PERLBREW_BASHRC_VERSION=0.67
    PERLBREW_HOME=/home/ikegami/.perlbrew
    PERLBREW_MANPATH=/home/ikegami/usr/perlbrew/perls/5.18.0t/man
    PERLBREW_PATH=/home/ikegami/usr/perlbrew/bin:/home/ikegami/usr/perlbrew/perls/5.18.0t/bin
    PERLBREW_PERL=5.18.0t
    PERLBREW_ROOT=/home/ikegami/usr/perlbrew
    PERLBREW_VERSION=0.67
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #121700] Ambiguous use of -foo when it isn't ambiguous by Eric Brine
• Re: [perl #121700] Ambiguous use of -foo when it isn't ambiguous by Zefram
• Re: [perl #121700] Ambiguous use of -foo when it isn't ambiguous by Eric Brine
• Re: [perl #121700] Ambiguous use of -foo when it isn't ambiguous by ilmari