Rational denominator should not be zero.
MODIFY
mrbgems/mruby-rational/src/rational.c
mrbgems/mruby-rational/src/rational.c
@@ -135,6 +135,9 @@ rational_new_i(mrb_state *mrb, mrb_int n, mrb_int d)
{
mrb_int a;
+ if (d == 0) {
+ mrb_raise(mrb, E_ZERODIV_ERROR, "divided by 0 in rational");
+ }
a = i_gcd(n, d);
if ((n == MRB_INT_MIN || d == MRB_INT_MIN) && a == -1) {
mrb_raise(mrb, E_RANGE_ERROR, "integer overflow in rational");

Rational denominator should not be zero.