+=item *
+
+If it's the string C<':fatal'>, the compilation will croak on the first indirect syntax met.
+
+=item *
+
+If the key/value pair C<< hook => $hook >> comes first, C<$hook> will be called for each error with the object name as C<$_[0]>, the method name as C<$_[1]>, the current file as C<$_[2]> and the line number as C<$_[3]>.
+
+=item *
+
+Otherwise, a warning will be emitted for each indirect construct.
+
+=back