Scm_CurrentTime  2663 src/gauche.h   SCM_EXTERN ScmObj Scm_CurrentTime(void);
Scm_CurrentTime  1602 src/syslib.c   SCM_RESULT = Scm_CurrentTime();
Scm_CurrentTime   891 src/system.c           ScmTime *ct = SCM_TIME(Scm_CurrentTime());