import StdTuple
import StdList
import StdBool
+import GenEq
from Text import class Text(concat), instance Text String
instance MonadTrans (StateT Gamma) where
liftT m = StateT \s-> m >>= \a-> return (a, s)
-get = gets id
+get :== gets id
sem :: AST -> SemOutput
sem (AST vd fd) = case runStateT m ('Map'.newMap, getRandomStream 1) of
>>= \mt->case mt of
Nothing = liftT $ Left $ UndeclaredVariableError p ident
Just t = unify t fs
-
typeOp2 :: Expr Expr Op2 [Type] Type -> Env Type
typeOp2 e1 e2 op ts ret = typeExpr e1 >>= \t1-> typeExpr e2 >>= \t2->
unify t1 t2 >>= \t3->if (isMember t3 ts) (pure ret)
restoreGamma :: Gamma -> Env Void
restoreGamma (oldstate, _) = gets snd >>= \newr->put (oldstate, newr)
+
+derive gEq Type
+instance == Type where
+ (==) (IdType _) (IdType _) = True
+ (==) o1 o2 = gEq{|*|} o1 o2