nextafter           3 ext/-test-/float/extconf.h #define TEST_INIT_FUNCS(X) X(nextafter)
nextafter          10 ext/-test-/float/nextafter.c     z = nextafter(x, y);
nextafter         185 include/ruby/missing.h RUBY_EXTERN double nextafter(double x, double y);
nextafter        1663 numeric.c          y = nextafter(x, INFINITY);
nextafter        1715 numeric.c          y = nextafter(x, -INFINITY);