; res <- tcExtendIdEnv1 name id thing_inside
; return (mkHsWrapPatCoI coi (VarPat id) pat_ty, res) }
-{- Need this if we re-add Method constraints
- ; (res, binds) <- bindInstsOfPatId id $
- tcExtendIdEnv1 name id $
- (traceTc (text "binding" <+> ppr name <+> ppr (idType id))
- >> thing_inside)
- ; let pat' | isEmptyTcEvBinds binds = VarPat id
- | otherwise = VarPatOut id binds
- ; return (mkHsWrapPatCoI coi pat' pat_ty, res) }
--}
-
tc_pat penv (ParPat pat) pat_ty thing_inside
= do { (pat', res) <- tc_lpat pat pat_ty penv thing_inside
; return (ParPat pat', res) }
; res <- tcExtendIdEnv1 name bndr_id thing_inside
; return (mkHsWrapPatCoI coi pat' pat_ty, res) }
-tc_pat _ _other_pat _ _ = panic "tc_pat" -- ConPatOut, SigPatOut, VarPatOut
+tc_pat _ _other_pat _ _ = panic "tc_pat" -- ConPatOut, SigPatOut
----------------
unifyPatType :: TcType -> TcType -> TcM CoercionI
; setSrcSpan con_span $ addDataConStupidTheta data_con ctxt_res_tys
; checkExistentials ex_tvs penv
- ; let skol_info = case pe_ctxt penv of
- LamPat mc -> PatSkol data_con mc
- LetPat {} -> UnkSkol -- Doesn't matter
- ; ex_tvs' <- tcInstSkolTyVars skol_info ex_tvs
+ ; ex_tvs' <- tcInstSuperSkolTyVars ex_tvs
-- Get location from monad, not from ex_tvs
; let pat_ty' = mkTyConApp tycon ctxt_res_tys
-- order is *important* as we generate the list of
-- dictionary binders from theta'
no_equalities = not (any isEqPred theta')
-
+ skol_info = case pe_ctxt penv of
+ LamPat mc -> PatSkol data_con mc
+ LetPat {} -> UnkSkol -- Doesn't matter
+
; gadts_on <- xoptM Opt_GADTs
; checkTc (no_equalities || gadts_on)
(ptext (sLit "A pattern match on a GADT requires -XGADTs"))
-- Trac #2905 decided that a *pattern-match* of a GADT
-- should require the GADT language flag
- ; given <- newEvVars theta'
+ ; given <- newEvVars theta'
; (ev_binds, (arg_pats', res))
<- checkConstraints skol_info ex_tvs' given $
tcConArgs data_con arg_tys' arg_pats penv thing_inside