731bdc5115
Aeshash currently computes the hash of the empty string as
hash("", seed) = seed. This is bad because the hash of a compound
object with empty strings in it doesn't include information about
where those empty strings were. For instance [2]string{"", "foo"}
and [2]string{"foo", ""} might get the same hash.
Fix this by returning a scrambled seed instead of the seed itself.
With this fix, we can remove the scrambling done by the generated
array hash routines.
The test also rejects hash("", seed) = 0, if we ever thought
it would be a good idea to try that.
The fallback hash is already OK in this regard.
Change-Id: Iaedbaa5be8d6a246dc7e9383d795000e0f562037
Reviewed-on: https://go-review.googlesource.com/14129
Reviewed-by: jcd . <jcd@golang.org>
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