AnyEvent->child() with no pid arg

[Kevin Ryde]

(Resend requested by the rt autoreply.)

Is the AnyEvent->child() code supposed to notice a missing "pid"
argument?  I see a croak, but foo.pl below doesn't seem to induce it
(recent debian i386 AnyEvent 5.31 or the cvs).

    perl foo.pl
    =>
    no errors

Is the "+0" making $pid defined() too early?  It's numizes strange
things coming in or something is it?  Perhaps the change below,

    perl foo.pl
    =>
    required option 'pid' is missing at foo.pl line 11

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