-- signatures in it. The renamer checked all this
tcHsBootSigs (ValBindsOut binds sigs)
= do { checkTc (null binds) badBootDeclErr
- ; mapM (addLocM tc_boot_sig) (filter isVanillaLSig sigs) }
+ ; mapM (addLocM tc_boot_sig) (filter isTypeLSig sigs) }
where
tc_boot_sig (TypeSig (L _ name) ty)
= do { sigma_ty <- tcHsSigType (FunSigCtxt name) ty
tcValBinds top_lvl (ValBindsOut binds sigs) thing_inside
= do { -- Typecheck the signature
; let { prag_fn = mkPragFun sigs
- ; ty_sigs = filter isVanillaLSig sigs
+ ; ty_sigs = filter isTypeLSig sigs
; sig_fn = mkTcSigFun ty_sigs }
; poly_ids <- checkNoErrs (mapAndRecoverM tcTySig ty_sigs)
tcPrag poly_id (SpecSig _ hs_ty inl) = tcSpecPrag poly_id hs_ty inl
tcPrag poly_id (SpecInstSig hs_ty) = tcSpecPrag poly_id hs_ty defaultInlineSpec
tcPrag _ (InlineSig _ inl) = return (InlinePrag inl)
-tcPrag _ (FixSig {}) = panic "tcPrag FixSig"
-tcPrag _ (TypeSig {}) = panic "tcPrag TypeSig"
+tcPrag _ sig = pprPanic "tcPrag" (ppr sig)
tcSpecPrag :: TcId -> LHsType Name -> InlineSpec -> TcM Prag
(strictBindErr "Recursive" unlifted mbind)
; checkTc (isSingletonBag mbind)
(strictBindErr "Multiple" unlifted mbind)
+ -- This should be a checkTc, not a warnTc, but as of GHC 6.11
+ -- the versions of alex and happy available have non-conforming
+ -- templates, so the GHC build fails if it's an error:
+ ; warnTc (not bang_pat)
+ (unliftedMustBeBang mbind)
; mapM_ check_sig infos
; return True }
| otherwise
(badStrictSig unlifted sig)
check_sig _ = return ()
+unliftedMustBeBang :: LHsBindsLR Var Var -> SDoc
+unliftedMustBeBang mbind
+ = hang (text "Bindings containing unlifted types must use an outermost bang pattern:")
+ 4 (pprLHsBinds mbind)
+
strictBindErr :: String -> Bool -> LHsBindsLR Var Var -> SDoc
strictBindErr flavour unlifted mbind
= hang (text flavour <+> msg <+> ptext (sLit "aren't allowed:"))
-- where F is a type function and (F a ~ [a])
-- Then unification might succeed with a coercion. But it's much
-- much simpler to require that such signatures have identical contexts
- checkTc (all isIdentityCoercion cois)
+ checkTc (all isIdentityCoI cois)
(ptext (sLit "Mutually dependent functions have syntactically distinct contexts"))
}
-- Precondition: no duplicates
mkTcSigFun sigs = lookupNameEnv env
where
- env = mkNameEnv [(name, hsExplicitTvs lhs_ty)
- | L _ (TypeSig (L _ name) lhs_ty) <- sigs]
+ env = mkNameEnv (mapCatMaybes mk_pair sigs)
+ mk_pair (L _ (TypeSig (L _ name) lhs_ty)) = Just (name, hsExplicitTvs lhs_ty)
+ mk_pair (L _ (IdSig id)) = Just (idName id, [])
+ mk_pair _ = Nothing
-- The scoped names are the ones explicitly mentioned
-- in the HsForAll. (There may be more in sigma_ty, because
-- of nested type synonyms. See Note [More instantiated than scoped].)
= setSrcSpan span $
do { sigma_ty <- tcHsSigType (FunSigCtxt name) ty
; return (mkLocalId name sigma_ty) }
+tcTySig (L _ (IdSig id))
+ = return id
tcTySig s = pprPanic "tcTySig" (ppr s)
-------------------