1 files changed, 9 insertions, 0 deletions
diff --git a/test/ruby/test_bignum.rb b/test/ruby/test_bignum.rb
index 2d9008ecce..be33e2f5af 100644
--- a/test/ruby/test_bignum.rb
+++ b/test/ruby/test_bignum.rb
@@ -377,4 +377,13 @@ class TestBignum < Test::Unit::TestCase
   def test_interrupt
     assert(interrupt { (65536 ** 65536).to_s })
   end
+
+  def test_too_big_to_s
+    i = 32
+    while (big = 2**(i-1)-1).is_a?(Fixnum)
+      i *= 2
+    end
+    e = assert_raise(RangeError) {(1 << big).to_s}
+    assert_match(/too big to convert/, e.message)
+  end
 end