* numeric.c (fix_pow): Handle special cases when base is 0, -1 or +1

  [Bug #5713] [Bug #5715]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39064 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 19 insertions, 0 deletions

diff --git a/test/ruby/test_fixnum.rb b/test/ruby/test_fixnum.rb
index 4567da0a60..85c8bdfa7b 100644
--- a/test/ruby/test_fixnum.rb
+++ b/test/ruby/test_fixnum.rb
@@ -279,4 +279,23 @@ class TestFixnum < Test::Unit::TestCase
   def test_frozen
     assert_equal(true, 1.frozen?)
   end
+
+  def assert_eql(a, b, mess)
+    assert a.eql?(b), "expected #{a} & #{b} to be eql? #{mess}"
+  end
+
+  def test_power_of_1_and_minus_1
+    bug5715 = '[ruby-core:41498]'
+    big = 1 << 66
+    assert_eql  1, 1 ** -big        , bug5715
+    assert_eql  1, (-1) ** -big     , bug5715
+    assert_eql -1, (-1) ** -(big+1) , bug5715
+  end
+
+  def test_power_of_0
+    bug5713 = '[ruby-core:41494]'
+    big = 1 << 66
+    assert_raise(ZeroDivisionError, bug5713) { 0 ** -big }
+    assert_raise(ZeroDivisionError, bug5713) { 0 ** Rational(-2,3) }
+  end
 end