Data point, it works on *nix ( ++ the shebang line!). I added a print scalar(@args)," \@args present.",$/; giving this output:
$ ./CorionDump.pl
$symbol here is *main::wrapped_NoAttr
$first here is bar
They are not the same.
1 @args present.
This works :bar
Use of uninitialized value in concatenation (.) at ./CorionDump.pl lin
+e 33.
This dosen't work (core dump) :
foo
$ ls
CorionDump.pl
$

[download]
The placeholder behavior you describe is for post-wrappers. In a pre-wrapper assigning to $_[-1] triggers preemption, skipping to inner layers of wrappers IIUC.

Hook::LexWrap appears to autovivify wrappers to undef in lines like:

# Hook/LexWrap.pm:43
                  () = $wrapper{post}->(@_, $return)
                            if $wrapper{post};

[download]
I looks like if exists $wrapper{'post'}; should be preferred. Unfortunately, I don't use a recent enough AS installation to help with Windows specific problems, but I can imagine that undef coderefs might confuse it.

After Compline,
Zaxo

In reply to Re: Bug ? Perl dumps core on reference to @_ ? by Zaxo
in thread Bug ? Perl dumps core on reference to @_ ? by Corion

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