SCM_SYM_OPEN_PAREN  446 src/regexp.c           return SCM_SYM_OPEN_PAREN;
SCM_SYM_OPEN_PAREN  466 src/regexp.c       return SCM_SYM_OPEN_PAREN;
SCM_SYM_OPEN_PAREN  599 src/regexp.c           if (SCM_EQ(token, SCM_SYM_OPEN_PAREN)) {