ISEQ_COVERAGE     255 compile.c            if ((event) == RUBY_EVENT_LINE && ISEQ_COVERAGE(iseq) && \
ISEQ_COVERAGE     257 compile.c      	  RARRAY_ASET(ISEQ_COVERAGE(iseq), (line) - 1, INT2FIX(0)); \
ISEQ_COVERAGE    8306 compile.c          if (RTEST(ISEQ_COVERAGE(iseq))) {
ISEQ_COVERAGE     717 iseq.c             return ISEQ_COVERAGE(iseq);