This is used to suppress compiler warnings that a parameter to a function is
not used. This situation can arise, for example, when a parameter is needed
under some configuration conditions, but not others, so that C preprocessor
-conditional compilation causes it be used just some times.
+conditional compilation causes it be used just sometimes.
=for apidoc Amn;||PERL_UNUSED_CONTEXT
This is used to suppress compiler warnings that the thread context parameter to