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author | https://www.joachim-breitner.de/ <nomeata@web> | 2017-05-07 03:20:39 +0000 |
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committer | admin <admin@branchable.com> | 2017-05-07 03:20:39 +0000 |
commit | 0d178f087b6a0a5c761df7765d15544dcff948a1 (patch) | |
tree | 53b0425487a9574954d1355180754e09f1ae1a4d /doc | |
parent | 09d8a31d108c37bcf92096c03659f4ad97062945 (diff) | |
download | debug-me-0d178f087b6a0a5c761df7765d15544dcff948a1.tar.gz |
Added a comment
Diffstat (limited to 'doc')
-rw-r--r-- | doc/protocol/comment_3_6338e14886f146eb5d2f9c9316e1f7de._comment | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/protocol/comment_3_6338e14886f146eb5d2f9c9316e1f7de._comment b/doc/protocol/comment_3_6338e14886f146eb5d2f9c9316e1f7de._comment new file mode 100644 index 0000000..657a20a --- /dev/null +++ b/doc/protocol/comment_3_6338e14886f146eb5d2f9c9316e1f7de._comment @@ -0,0 +1,22 @@ +[[!comment format=mdwn + username="https://www.joachim-breitner.de/" + nickname="nomeata" + avatar="http://cdn.libravatar.org/avatar/a2112893817513537c6a2c228c04c138a2f68bba57121ab7f267de58fc5171d7" + subject="comment 3" + date="2017-05-07T03:20:38Z" + content=""" +Still not good, I think, as the instance `Hashable Hash` has `hash = id`, so + + hash Nothing + = hash () + = id (hash ()) + = hash (Just (hash ()) + + and we have a collision at type `Maybe Hash`. + +What would work is to do the same that `Hashable []` does, i.e. has the hash again: + + hash (Just v) = hash (val (hashValue v)) + hash Nothing = hash (mempty :: B.ByteString) + +"""]] |