Haddock displays kind annotations oddly. At a guess (which could well be
off base; I'm still rather weak on this stuff), Spock has PolyKinds
enabled, so an explicit (x :: *) kind annotation must be preserved as an
override to the default of allowing any kind; if PolyKinds is not enabled,
then * is the default kind and wouldn't be annotated. (Reader beware: * is
not a wildcard/"match any", it is specifically the kind of inhabited boxed
types!)
On Fri, Jan 13, 2017 at 3:31 AM, Haiwei Zhou
Hi,
I am reading the document of spock-0.11, and found two strange definitions in the Web.Spock.
```` type Var a = Path ((:) * a ([] *)) Open
var :: (Typeable * a, PathPiece a) => Path ((:) * a ([] *)) Open
````
What's the meaning of the star between Typeable and a ?
The kind of Typeable is * -> *. I cannot understand why the Typeable in the var prototype takes two kinds.
In the Web.Routing.Combinators of reroute-0.4, those are defined as following:
```` type Var a = Path (a ': '[]) Open
var :: (Typeable a, PathPiece a) => Path (a ': '[]) Open
````
Why there are two difference definition about the same thing?
Thanks, Haiwei
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