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package Foo;

...
# These croak
$foo->floozle()
$foo->floozle( 9, 'a' );

Variable "$self" is not imported at t/lib/Foo.pm line ##.
Global symbol "$self" requires explicit package name at t/lib/Foo.pm l
+ine ##.

Variable "%s" is not imported%s

    (F) While "use strict" in effect, you referred to a global variabl
+e that you apparently thought was imported from another module, becau
+se something else of the same name (usually a subroutine) is exported
+ by that module. It usually means you put the wrong funny character o
+n the front of your variable.