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Add an eliminator for :=>.

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This commit is contained in:
Rob Rix 2016-06-16 16:23:12 -04:00
parent a08b83432f
commit dcf9cdc6ae
1 changed files with 3 additions and 0 deletions
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src/Data/Record.hs
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@ -29,6 +29,9 @@ newtype a :=> b = (:=>) (Tagged a b)
field :: b -> a :=> b field :: b -> a :=> b
field = (:=>) . Tagged field = (:=>) . Tagged
unField :: a :=> b -> b
unField ((:=>) b) = unTagged b
-- Classes -- Classes