rational.c: infinity in power

* rational.c (nurat_expt): return Infinity due to overflow.
  [ruby-core:79686] [Bug #13242]:

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57688 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/numeric.c b/numeric.c
index 65edfec205..16cdbb261a 100644
--- a/numeric.c
+++ b/numeric.c
@@ -3913,6 +3913,8 @@ int_pow(long x, unsigned long y)
 		VALUE v;
 	      bignum:
 		v = rb_big_pow(rb_int2big(x), LONG2NUM(y));
+		if (RB_FLOAT_TYPE_P(v)) /* infinity due to overflow */
+		    return v;
 		if (z != 1) v = rb_big_mul(rb_int2big(neg ? -z : z), v);
 		return v;
 	    }