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{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE Rank2Types #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE GADTs #-}
module T18920 where
import Data.Kind
class Monad solver => Solver solver where
type Constraint solver :: Type
type Label solver :: Type
class Queue q
data Tree s a where
NewVar :: Term s t => (t -> Tree s a) -> Tree s a
class Solver solver => Term solver term
class Transformer t where
type EvalState t :: Type
type TreeState t :: Type
type ForSolver t :: (Type -> Type)
type ForResult t :: Type
nextT :: SearchSig (ForSolver t) q t (ForResult t)
returnT :: ContinueSig solver q t (ForResult t)
type ContinueSig solver q t a =
( Solver solver, Queue q, Transformer t )
=> Int -> q -> t -> EvalState t
-> solver (Int, [a])
type SearchSig solver q t a =
(Solver solver, Queue q, Transformer t )
=> Int -> Tree solver a -> q -> t -> EvalState t -> TreeState t
-> solver (Int,[a])
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