sym_before       1995 src/extlib.c   static ScmObj sym_before = SCM_UNBOUND;
sym_before       2030 src/extlib.c     else if (mode == sym_before)   retmode = SCM_STRING_SCAN_BEFORE;
sym_before       6141 src/extlib.c     sym_before = Scm_Intern(&sym_before__NAME);