Fix a bug in MatchCon, and clarify what dataConInstOrigArgTys does

[ghc-hetmet.git] / compiler / typecheck / TcTyClsDecls.lhs

diff --git a/compiler/typecheck/TcTyClsDecls.lhs b/compiler/typecheck/TcTyClsDecls.lhs
index 50e0f4c..3217a95 100644 (file)
--- a/compiler/typecheck/TcTyClsDecls.lhs
+++ b/compiler/typecheck/TcTyClsDecls.lhs
@@ -133,7 +133,7 @@ tcTyAndClassDecls :: ModDetails -> [LTyClDecl Name]
                   -> TcM TcGblEnv      -- Input env extended by types and classes 
                                        -- and their implicit Ids,DataCons
 tcTyAndClassDecls boot_details allDecls
-  = do {       -- Omit instances of indexed types; they are handled together
+  = do {       -- Omit instances of type families; they are handled together
                -- with the *heads* of class instances
         ; let decls = filter (not . isFamInstDecl . unLoc) allDecls
 
@@ -239,9 +239,9 @@ tcFamInstDecl (L loc decl)
     recoverM (returnM Nothing)                 $
     setSrcSpan loc                             $
     tcAddDeclCtxt decl                         $
-    do { -- type families require -findexed-types and can't be in an
+    do { -- type families require -ftype-families and can't be in an
         -- hs-boot file
-       ; gla_exts <- doptM Opt_IndexedTypes
+       ; gla_exts <- doptM Opt_TypeFamilies
        ; is_boot  <- tcIsHsBoot          -- Are we compiling an hs-boot file?
        ; checkTc gla_exts      $ badFamInstDecl (tcdLName decl)
        ; checkTc (not is_boot) $ badBootFamInstDeclErr
@@ -392,7 +392,7 @@ So we must infer their kinds from their right-hand sides *first* and then
 use them, whereas for the mutually recursive data types D we bring into
 scope kind bindings D -> k, where k is a kind variable, and do inference.
 
-Indexed Types
+Type families
 ~~~~~~~~~~~~~
 This treatment of type synonyms only applies to Haskell 98-style synonyms.
 General type functions can be recursive, and hence, appear in `alg_decls'.
@@ -618,9 +618,9 @@ tcTyClDecl1 _calc_isrec
                                                      --     kind checking
   = tcTyVarBndrs tvs  $ \ tvs' -> do 
   { traceTc (text "type family: " <+> ppr tc_name) 
-  ; idx_tys <- doptM Opt_IndexedTypes
+  ; idx_tys <- doptM Opt_TypeFamilies
 
-       -- Check that we don't use families without -findexed-types
+       -- Check that we don't use families without -ftype-families
   ; checkTc idx_tys $ badFamInstDecl tc_name
 
   ; tycon <- buildSynTyCon tc_name tvs' (OpenSynTyCon kind Nothing) Nothing
@@ -636,9 +636,9 @@ tcTyClDecl1 _calc_isrec
   ; extra_tvs <- tcDataKindSig mb_kind
   ; let final_tvs = tvs' ++ extra_tvs    -- we may not need these
 
-  ; idx_tys <- doptM Opt_IndexedTypes
+  ; idx_tys <- doptM Opt_TypeFamilies
 
-       -- Check that we don't use families without -findexed-types
+       -- Check that we don't use families without -ftype-families
   ; checkTc idx_tys $ badFamInstDecl tc_name
 
   ; tycon <- buildAlgTyCon tc_name final_tvs [] 
@@ -657,10 +657,11 @@ tcTyClDecl1 calc_isrec
   ; want_generic <- doptM Opt_Generics
   ; unbox_strict <- doptM Opt_UnboxStrictFields
   ; gla_exts     <- doptM Opt_GlasgowExts
+  ; gadt_ok      <- doptM Opt_GADTs
   ; is_boot     <- tcIsHsBoot  -- Are we compiling an hs-boot file?
 
        -- Check that we don't use GADT syntax in H98 world
-  ; checkTc (gla_exts || h98_syntax) (badGadtDecl tc_name)
+  ; checkTc (gadt_ok || h98_syntax) (badGadtDecl tc_name)
 
        -- Check that we don't use kind signatures without Glasgow extensions
   ; checkTc (gla_exts || isNothing mb_ksig) (badSigTyDecl tc_name)
@@ -1008,6 +1009,9 @@ checkNewDataCon con
                -- Return type is (T a b c)
        ; checkTc (null ex_tvs && null theta) (newtypeExError con)
                -- No existentials
+       ; checkTc (not (any isMarkedStrict (dataConStrictMarks con))) 
+                 (newtypeStrictError con)
+               -- No strictness
     }
   where
     (_univ_tvs, ex_tvs, eq_spec, theta, arg_tys, _res_ty) = dataConFullSig con
@@ -1139,7 +1143,7 @@ badDataConTyCon data_con
 
 badGadtDecl tc_name
   = vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+> quotes (ppr tc_name)
-        , nest 2 (parens $ ptext SLIT("Use -fglasgow-exts to allow GADTs")) ]
+        , nest 2 (parens $ ptext SLIT("Use -X=GADT to allow GADTs")) ]
 
 badStupidTheta tc_name
   = ptext SLIT("A data type declared in GADT style cannot have a context:") <+> quotes (ppr tc_name)
@@ -1152,6 +1156,10 @@ newtypeExError con
   = sep [ptext SLIT("A newtype constructor cannot have an existential context,"),
         nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does")]
 
+newtypeStrictError con
+  = sep [ptext SLIT("A newtype constructor cannot have a strictness annotation,"),
+        nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does")]
+
 newtypePredError con
   = sep [ptext SLIT("A newtype constructor must have a return type of form T a1 ... an"),
         nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does not")]
@@ -1168,7 +1176,7 @@ badSigTyDecl tc_name
 badFamInstDecl tc_name
   = vcat [ ptext SLIT("Illegal family instance for") <+>
           quotes (ppr tc_name)
-        , nest 2 (parens $ ptext SLIT("Use -findexed-types to allow indexed type families")) ]
+        , nest 2 (parens $ ptext SLIT("Use -X=TypeFamilies to allow indexed type families")) ]
 
 badGadtIdxTyDecl tc_name
   = vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+>