modifier is special in that it can only be enabled,
+Note that the C modifier is special in that it can only be enabled,
not disabled, and that its presence anywhere in a pattern has a global
-effect. Thus C<(?-k)> and C<(?-k:...)> are meaningless and will warn
+effect. Thus C<(?-p)> and C<(?-p:...)> are meaningless and will warn
when executed under C