[perl #113836] KEYWORD_PLUGIN_NOOP for keyword plugins

# New Ticket Created by  l.mai@web.de 
# Please include the string:  [perl #113836]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=113836 >



This is a bug report for perl from l.mai@web.de,
generated with the help of perlbug 1.39 running under perl 5.16.0.


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

There should be a way for keyword plugins to indicate that a keyword was
recognized but no optree was built. The perl parser should continue parsing the
source as if no keyword had been seen.

Currently all keyword plugins have to pretend to be an expression
(KEYWORD_PLUGIN_EXPR) or a statement (KEYWORD_PLUGIN_STMT). This is unfortunate
for modules like Devel::Declare that want to inject source code at the current
parse point.

I propose adding KEYWORD_PLUGIN_NOOP. It indicates that the keyword was
recognized and processed but no optree was built. It is otherwise transparent
to the lexer.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=wishlist
---
This perlbug was built using Perl 5.12.1 - Thu Jun  3 20:09:15 CEST 2010
It is being executed now by  Perl 5.16.0 - Mon May 21 12:24:16 CEST 2012.

Site configuration information for perl 5.16.0:

Configured by mauke at Mon May 21 12:24:16 CEST 2012.

Summary of my perl5 (revision 5 version 16 subversion 0) configuration:
   
  Platform:
    osname=linux, osvers=2.6.38-gentoo-r6, archname=i686-linux
    uname='linux nora 2.6.38-gentoo-r6 #1 preempt sat aug 6 03:05:34 cest 2011 i686 amd athlon(tm) 64 processor 3200+ authenticamd gnulinux '
    config_args='-Dcc=cgcc -Dprefix=/home/mauke/usr/local -Dman1dir=none -Dman3dir=none -Dinc_version_list=none -Doptimize=-O2 -flto'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cgcc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -flto',
    cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.6.3', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cgcc', ldflags ='-fstack-protector -L/usr/local/lib -O2 -flto'
    libpth=/usr/local/lib /lib/../lib /usr/lib/../lib /lib /usr/lib
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -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 -flto -L/usr/local/lib -fstack-protector'

Locally applied patches:
    SAVEARGV0 - disable magic open in <ARGV>

---
@INC for perl 5.16.0:
    /home/mauke/usr/local/lib/perl5/site_perl/5.16.0/i686-linux
    /home/mauke/usr/local/lib/perl5/site_perl/5.16.0
    /home/mauke/usr/local/lib/perl5/5.16.0/i686-linux
    /home/mauke/usr/local/lib/perl5/5.16.0
    .

---
Environment for perl 5.16.0:
    HOME=/home/mauke
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_COLLATE=POSIX
    LD_LIBRARY_PATH=/home/mauke/usr/local/lib
    LOGDIR (unset)
    PATH=/home/mauke/usr/perlbrew/bin:/home/mauke/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/4.4.5:/opt/sun-jdk-1.4.2.13/bin:/opt/sun-jdk-1.4.2.13/jre/bin:/opt/sun-jdk-1.4.2.13/jre/javaws:/opt/dmd/bin:/usr/games/bin
    PERLBREW_BASHRC_VERSION=0.43
    PERLBREW_HOME=/home/mauke/.perlbrew
    PERLBREW_PATH=/home/mauke/usr/perlbrew/bin
    PERLBREW_ROOT=/home/mauke/usr/perlbrew
    PERLBREW_VERSION=0.27
    PERL_BADLANG (unset)
    PERL_UNICODE=SAL
    SHELL=/bin/bash

• [perl #113836] KEYWORD_PLUGIN_NOOP for keyword plugins by l . mai @ web . de
• Re: [perl #113836] KEYWORD_PLUGIN_NOOP for keyword plugins by Lukas Mai
• Re: [perl #113836] KEYWORD_PLUGIN_NOOP for keyword plugins by Zefram
• Re: [perl #113836] KEYWORD_PLUGIN_NOOP for keyword plugins by Lukas Mai