True iff the module could have been built with thread-safety features enabled.
+=head1 DIAGNOSTICS
+
+=head2 C<Indirect call of method "%s" on object "%s" at %s line %d.>
+
+The default warning/exception message thrown when an indirect call on an object is found.
+
+=head2 C<Indirect call of method "%s" on a block at %s line %d.>
+
+The default warning/exception message thrown when an indirect call on a block is found.
+
=head1 CAVEATS
The implementation was tweaked to work around several limitations of vanilla C<perl> pragmas : it's thread safe, and doesn't suffer from a C<perl 5.8.x-5.10.0> bug that causes all pragmas to propagate into C<require>d scopes.