[Haskell-cafe] Re: Composition of Type Constructors

Philippa Cowderoy flippa at flippac.org
Mon May 30 09:59:58 EDT 2005

On Mon, 30 May 2005, Jan Christiansen wrote:

> It's not allowed to make an instance of a type synonym and partially applied 
> type synonyms are not allowed anyway. Is there a reason why partial 
> application of type synonyms are forbidden?

It turns the type system into an FPL all of its own, which means the type 
checker isn't guaranteed to terminate.

flippa at flippac.org

There is no magic bullet. There are, however, plenty of bullets that 
magically home in on feet when not used in exactly the right circumstances.

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