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Better Detection of Functional Dependencies #2

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softmechanics opened this issue Apr 7, 2010 · 0 comments

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softmechanics commented Apr 7, 2010

class A a b | a -> b where {}
instance (A a b, B b) => Test a
instance (A a b, C b) => Test a

In order to choose an instance of Test, we need to A to "resolve" b to a type, and update references to b when checking B and C.

This is partially complete, with the following todos:

Only allow classes with functional dependencies to resolve types.
Only resolve types for which all dependencies are known types (not variables). In the case of A, only resolve b if a is known.

The text was updated successfully, but these errors were encountered:

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