s |void |forbid_setid |const char flag|const bool suidscript
s |void |incpush |NULLOK const char *const dir|STRLEN len \
|U32 flags
-s |void |incpush_use_sep|NULLOK const char *p|U32 flags
+s |void |incpush_use_sep|NN const char *p|STRLEN len|U32 flags
s |void |init_interp
s |void |init_ids
s |void |init_main_stash