tidyInsts, tidyMoreInsts,
newDictBndr, newDictBndrs, newDictBndrsO,
+ newDictOccs, newDictOcc,
instCall, instStupidTheta,
cloneDict, mkOverLit,
newIPDict, newMethod, newMethodFromName, newMethodWithGivenTy,
newDictBndrs inst_loc theta = mapM (newDictBndr inst_loc) theta
newDictBndr :: InstLoc -> TcPredType -> TcM Inst
+-- Makes a "given"
newDictBndr inst_loc pred@(EqPred ty1 ty2)
= do { uniq <- newUnique
; let name = mkPredName uniq inst_loc pred
+ co = mkGivenCo $ TyVarTy (Var.mkCoVar name (PredTy pred))
; return (EqInst {tci_name = name,
tci_loc = inst_loc,
tci_left = ty1,
tci_right = ty2,
- tci_co = mkGivenCo $ TyVarTy (Var.mkCoVar name (PredTy pred))})
- }
-newDictBndr inst_loc pred
+ tci_co = co }) }
+
+newDictBndr inst_loc pred = newDict inst_loc pred
+
+-------------------
+newDictOccs :: InstLoc -> TcThetaType -> TcM [Inst]
+newDictOccs inst_loc theta = mapM (newDictOcc inst_loc) theta
+
+newDictOcc :: InstLoc -> TcPredType -> TcM Inst
+-- Makes a "wanted"
+newDictOcc inst_loc pred@(EqPred ty1 ty2)
+ = do { uniq <- newUnique
+ ; cotv <- newMetaCoVar ty1 ty2
+ ; let name = mkPredName uniq inst_loc pred
+ ; return (EqInst {tci_name = name,
+ tci_loc = inst_loc,
+ tci_left = ty1,
+ tci_right = ty2,
+ tci_co = Left cotv }) }
+
+newDictOcc inst_loc pred = newDict inst_loc pred
+
+----------------
+newDict :: InstLoc -> TcPredType -> TcM Inst
+-- Always makes a Dict, not an EqInst
+newDict inst_loc pred
= do { uniq <- newUnique
; let name = mkPredName uniq inst_loc pred
; return (Dict {tci_name = name, tci_pred = pred, tci_loc = inst_loc}) }
instCallDicts loc (EqPred ty1 ty2 : preds)
= do { traceTc (text "instCallDicts" <+> ppr (EqPred ty1 ty2))
; coi <- boxyUnify ty1 ty2
--- ; coi <- unifyType ty1 ty2
; let co = fromCoI coi ty1
; co_fn <- instCallDicts loc preds
; return (co_fn <.> WpTyApp co) }
instCallDicts loc (pred : preds)
- = do { uniq <- newUnique
- ; let name = mkPredName uniq loc pred
- dict = Dict {tci_name = name, tci_pred = pred, tci_loc = loc}
+ = do { dict <- newDict loc pred
; extendLIE dict
; co_fn <- instCallDicts loc preds
; return (co_fn <.> WpApp (instToId dict)) }
-------------
cloneDict :: Inst -> TcM Inst
cloneDict dict@(Dict nm _ _) = do { uniq <- newUnique
- ; return (dict {tci_name = setNameUnique nm uniq}) }
-cloneDict eq@(EqInst {}) = return eq
+ ; return (dict {tci_name = setNameUnique nm uniq}) }
+cloneDict eq@(EqInst {}) = return eq
cloneDict other = pprPanic "cloneDict" (ppr other)
-- For vanilla implicit parameters, there is only one in scope
-- scope, so we make up a new namea.
newIPDict :: InstOrigin -> IPName Name -> Type
-> TcM (IPName Id, Inst)
-newIPDict orig ip_name ty = do
- inst_loc <- getInstLoc orig
- uniq <- newUnique
- let
- pred = IParam ip_name ty
- name = mkPredName uniq inst_loc pred
- dict = Dict {tci_name = name, tci_pred = pred, tci_loc = inst_loc}
-
- return (mapIPName (\_ -> instToId dict) ip_name, dict)
+newIPDict orig ip_name ty
+ = do { inst_loc <- getInstLoc orig
+ ; dict <- newDict inst_loc (IParam ip_name ty)
+ ; return (mapIPName (\_ -> instToId dict) ip_name, dict) }
\end{code}