Pop a memory managed data type
SLang_MMT_Type *SLang_pop_mmt (unsigned char t)
The SLang_pop_mmt function may be used to pop a memory managed
type of type t from the stack. It returns a pointer to the
memory managed object upon success, or NULL upon failure. The
function SLang_object_from_mmt should be used to access the
actual pointer to the data type.
SLang_object_from_mmt, SLang_push_mmt