From 2e2063fe16e2549123055f6f8aec5162cef01b99 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 22 Feb 2017 23:49:40 +0000
Subject: [PATCH] rational.c: infinity in power

* rational.c (nurat_expt): return 0 due to overflow.
  [ruby-core:79686] [Bug #13242]:

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57689 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 rational.c                 | 4 ++++
 test/ruby/test_rational.rb | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/rational.c b/rational.c
index e779505fd0..4bdc695dc1 100644
--- a/rational.c
+++ b/rational.c
@@ -1046,6 +1046,10 @@ nurat_expt(VALUE self, VALUE other)
 		if (RB_FLOAT_TYPE_P(den)) return DBL2NUM(NAN);
 		return num;
 	    }
+	    if (RB_FLOAT_TYPE_P(den)) { /* infinity due to overflow */
+		num = ZERO;
+		den = ONE;
+	    }
 	    return f_rational_new2(CLASS_OF(self), num, den);
 	}
     }
diff --git a/test/ruby/test_rational.rb b/test/ruby/test_rational.rb
index c1e7d824d1..e0cb8db99e 100644
--- a/test/ruby/test_rational.rb
+++ b/test/ruby/test_rational.rb
@@ -959,6 +959,8 @@ class Rational_Test < Test::Unit::TestCase
     bug = '[ruby-core:79686] [Bug #13242]: Infinity due to overflow'
     x = EnvUtil.suppress_warning {4r**40000000}
     assert_predicate x, :infinite?, bug
+    x = EnvUtil.suppress_warning {(1/4r)**40000000}
+    assert_equal 0, x, bug
   end
 
   def test_positive_p