Indeed, I messed up the copying in;

In my local version of foo.pm, I have no 'use warnings;' only 'use strict;' - which, very certainly overrides the 'local $^W = 0;', and gives us the warn.
(In other words, yea, the notice of bar being redefined is indeed there)

Oops?
-- Alexander Widdlemouse undid his bellybutton and his bum dropped off --