El Oct 27, 2014, a las 7:42, Herbert Valerio Riedel
On 2014-10-26 at 20:28:41 +0100, Tom Murphy wrote:
[...]
module Foo hiding (Lockbox(MkLockbox), internalFunction) where
I think its semantics are immediately clear to the reader.
There's a little bit of bikeshedding that needs to happen (e.g. is "hiding (Foo(..))" sufficient to hide the type Foo and not just its constructors), but are people +1 on this? I've frequently wanted this behavior.
PS: As for semantics, I'd suggest to have
module Foo hiding (Lockbox(MkLockbox), internalFunction) where
the same effect moving the definitions of `Foo` into an hidden/internal module `_Foo` and having `Foo` re-export it in the following way:
module Foo (module _Foo) where import _Foo hiding (Lockbox(MkLockbox), internalFunction)
that should result the least surprise IMHO
Right -- hiding a type necessarily hides its constructors (and importing a constructor necessarily imports its type), which actually implies an obvious semantics. So there's less to bikeshed than I had thought. Tom