diagnostic classes

[Tom Christiansen <tchrist@chthon.perl.com>]

% perl -we 'sub x() {1}; undef &x'
Constant subroutine x undefined at -e line 1.
% perl -e 'sub x() {1}; undef &x'

See?  No warning.  But perldiag lists that warning as being class
(S), which is a mandatory warning.  I'm not saying it should be,
but that perldiag should say whatever it really is.

--tom

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