(F) Only hard references may be blessed. This is how Perl "enforces"
encapsulation of objects. See L<perlobj>.
-=item Can't break at that line
-
-(S internal) A warning intended to only be printed while running within
-the debugger, indicating the line number specified wasn't the location
-of a statement that could be stopped at.
-
=item Can't call method "%s" in empty package "%s"
(F) You called a method correctly, and it correctly indicated a package