SCM_PORT_ERROR_CLOSED  608 src/error.c            case SCM_PORT_ERROR_CLOSED:
SCM_PORT_ERROR_CLOSED 2457 src/gauche.h       SCM_PORT_ERROR_CLOSED,
SCM_PORT_ERROR_CLOSED   87 src/portapi.c              Scm_PortError((port), SCM_PORT_ERROR_CLOSED,                \
SCM_PORT_ERROR_CLOSED  913 src/portapi.c          Scm_PortError(p, SCM_PORT_ERROR_CLOSED,