Instead of commenting out this failing test, it seem better to add to a new file
for failing tests. If and when we change Leo to accept field literals in hex, we
can move the test from the Fail file to the Pass fail.
This also helps the ACL2 tester, which is currently not handling comment-out
tests of this form.
This was apparently disabled, but it did not start with a block comment.
This commit fixes it to start with a block comment as required.
This commit also makes it a failing test, which is appropriate because in the
current version of Leo we do not allow untyped literals (i.e. lone numerals as
expressions), and it is thus a good negative test for the current version of
Leo. When we extend Leo to allow untyped literals, we can simply flip the
expectation of this test from Fail to Pass.
