lincat typecheck and abstract-interface extension fixed

src/GF/Compile/CheckGrammar.hs

@@ -214,6 +214,7 @@ checkCncInfo gr m (a,abs) (c,info) = do
                                                    -- cat for cf, typ for pe
 
     CncCat (Yes typ) mdef mpr -> chIn "linearization type of" $ do
+      checkErr $ lookupCatContextSrc gr a c
       typ'  <- checkIfLinType gr typ
       mdef' <- case mdef of
         Yes def -> do

src/GF/Compile/ModDeps.hs

@@ -93,6 +93,9 @@ moduleDeps ms = mapM deps ms where
 
   -- check for superficial compatibility, not submodule relation etc: what can be extended
   compatMType mt0 mt = case (mt0,mt) of
+    (MTResource,   MTConcrete _) -> True
+    (MTInstance _, MTConcrete _) -> True
+    (MTInterface,  MTAbstract)   -> True
     (MTConcrete _, MTConcrete _) -> True
     (MTInstance _, MTInstance _) -> True
     (MTReuse _, MTReuse _) -> True