[Haskell-cafe] How to express constraint succeeded?

[Li-yao Xia]

Hello Paul,

     (() :: Constraint)

is the empty constraint. The kind annotation is sometimes optional but 
useful to disambiguate from the unit type.

Li-yao

On 08/23/2018 07:18 AM, Paul wrote:
> Hello, Dear Cafe! I have expression
> 
>      'True ~ 'True
> 
> in right hand side of type level function. Is some "constant" for the same?
> 
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