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Reformatting + clarification comment

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This commit is contained in:
Gaël Deest 2022-03-23 12:49:58 +01:00
parent 04ba7e7a6b
commit b84095ee5a
1 changed files with 5 additions and 1 deletions
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6
servant/src/Servant/API/ResponseHeaders.hs
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@ -183,7 +183,11 @@ instance (AddHeader h v old new) => AddHeader h v (Union '[old]) (Union '[new])
SOP.Z $ SOP.I $ addOptionalHeader hdr $ SOP.unI $ SOP.unZ $ resp
instance
(AddHeader h v old new, AddHeader h v (Union oldrest) (Union newrest), oldrest ~ (a ': as), newrest ~ (b ': bs))
( AddHeader h v old new, AddHeader h v (Union oldrest) (Union newrest)
-- This ensures that the remainder of the response list is _not_ empty
-- It is necessary to prevent the two instances for union types from
-- overlapping.
, oldrest ~ (a ': as), newrest ~ (b ': bs))
=> AddHeader h v (Union (old ': (a ': as))) (Union (new ': (b ': bs))) where
addOptionalHeader hdr resp = case resp of
SOP.Z (SOP.I rHead) -> SOP.Z $ SOP.I $ addOptionalHeader hdr rHead