SCM_ROUND_ROUND  2190 src/gauche.h       SCM_ROUND_ROUND
SCM_ROUND_ROUND  1744 src/number.c       case SCM_ROUND_ROUND: r = roundeven(v); break;
SCM_ROUND_ROUND   760 src/stdlib.c    SCM_RESULT = (Scm_Round(v, SCM_ROUND_ROUND));