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Merge pull request #74 from haskell-servant/wip-whitespace-comment

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servant: clean up some white spaces, add link explaining why Or works.
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Alp Mestanogullari 2015-05-16 08:28:28 +01:00
commit e59c03faa2
1 changed files with 24 additions and 22 deletions
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6
servant/src/Servant/Utils/Links.hs
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@ -138,6 +138,8 @@ data Link = Link
-- | If either a or b produce an empty constraint, produce an empty constraint. -- | If either a or b produce an empty constraint, produce an empty constraint.
type family Or (a :: Constraint) (b :: Constraint) :: Constraint where type family Or (a :: Constraint) (b :: Constraint) :: Constraint where
-- This works because of:
-- https://ghc.haskell.org/trac/ghc/wiki/NewAxioms/CoincidentOverlap
Or () b = () Or () b = ()
Or a () = () Or a () = ()
@ -145,8 +147,8 @@ type family Or (a :: Constraint) (b :: Constraint) :: Constraint where
type family And (a :: Constraint) (b :: Constraint) :: Constraint where type family And (a :: Constraint) (b :: Constraint) :: Constraint where
And () () = () And () () = ()
-- | You may use this type family to tell the type checker that your custom type -- | You may use this type family to tell the type checker that your custom
-- may be skipped as part of a link. This is useful for things like -- type may be skipped as part of a link. This is useful for things like
-- 'QueryParam' that are optional in a URI and do not affect them if they are -- 'QueryParam' that are optional in a URI and do not affect them if they are
-- omitted. -- omitted.
-- --