Fix a bug spotted by Chris in my BigInteger patch; thanks!

The problem was this:
  Console.WriteLine(Int64.Parse("08000000000000000", NumberStyles.HexNumber));
  // => -9223372036854775808
  Console.WriteLine(Int64.Parse("9223372036854775808"));
  // => Value was either too large or too small for an Int64.

In other words, large hex numbers are interpreted as a sequence of bits, not as
an actual number.

1 files changed, 2 insertions, 0 deletions

diff --git a/Test/dafny4/LargeConstants.dfy.expect b/Test/dafny4/LargeConstants.dfy.expect
new file mode 100644
index 00000000..4ef2de53
--- /dev/null
+++ b/Test/dafny4/LargeConstants.dfy.expect
@@ -0,0 +1,2 @@
+

+Dafny program verifier finished with 6 verified, 0 errors