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[perl #107366] Allow attributes to set :lvalue on defined sub
This provides enough rope for those who want to hang themselves, and
also for those who know how to use the rope without hanging them-
selves. :-)
Since this is not generally a reliable thing to be doing, a warning is emitted whenever :lvalue is turned on or off on a defined subroutine.
But attributes.pm will flip the flag anyway. :lvalue in a sub declar-
ation still refuses to modify a defined Perl sub, as before.