+ SCM_FREEP, SCM_NFREEP, SCM_CHARS, SCM_UCHARS, SCM_VALIDATE_ROSTRING,
+ SCM_VALIDATE_ROSTRING_COPY, SCM_VALIDATE_NULLORROSTRING_COPY, SCM_ROLENGTH,
+ SCM_LENGTH, SCM_HUGE_LENGTH, SCM_SUBSTRP, SCM_SUBSTR_STR, SCM_SUBSTR_OFFSET,
+ SCM_COERCE_SUBSTR, SCM_ROSTRINGP, SCM_RWSTRINGP, SCM_VALIDATE_RWSTRING,
+ SCM_ROCHARS, SCM_ROUCHARS, SCM_SETLENGTH, SCM_SETCHARS, SCM_LENGTH_MAX,
+ SCM_GC8MARKP, SCM_SETGC8MARK, SCM_CLRGC8MARK, SCM_GCTYP16, SCM_GCCDR,
+ SCM_SUBR_DOC, SCM_OPDIRP, SCM_VALIDATE_OPDIR, SCM_WTA, RETURN_SCM_WTA