rb_match_busy    1228 complex.c          rb_match_busy(backref);
rb_match_busy    1248 complex.c          rb_match_busy(backref);
rb_match_busy     513 include/ruby/intern.h void rb_match_busy(VALUE);
rb_match_busy      56 include/ruby/re.h void rb_match_busy(VALUE);
rb_match_busy    1401 rational.c         rb_match_busy(backref);
rb_match_busy    1436 rational.c         rb_match_busy(backref);
rb_match_busy    2725 re.c               rb_match_busy(result);
rb_match_busy    3292 re.c               rb_match_busy(match);