lookupThName :: TH.Name -> TcM Name
lookupThName th_name@(TH.Name occ flavour)
- = do { let rdr_name = thRdrName guessed_ns occ_str flavour
-
- -- Repeat much of lookupOccRn, becase we want
- -- to report errors in a TH-relevant way
- ; rdr_env <- getLocalRdrEnv
- ; case lookupLocalRdrEnv rdr_env rdr_name of
- Just name -> return name
- Nothing | not (isSrcRdrName rdr_name) -- Exact, Orig
- -> lookupImportedName rdr_name
- | otherwise -- Unqual, Qual
- -> do { mb_name <- lookupSrcOcc_maybe rdr_name
- ; case mb_name of
- Just name -> return name
- Nothing -> failWithTc (notInScope th_name) }
- }
+ = do { mb_ns <- mapM lookup [ thRdrName gns occ_str flavour
+ | gns <- guessed_nss]
+ ; case catMaybes mb_ns of
+ [] -> failWithTc (notInScope th_name)
+ (n:_) -> return n } -- Pick the first that works
+ -- E.g. reify (mkName "A") will pick the class A
+ -- in preference to the data constructor A
where
- -- guessed_ns is the name space guessed from looking at the TH name
- guessed_ns | isLexCon (mkFastString occ_str) = OccName.dataName
- | otherwise = OccName.varName
+ lookup rdr_name
+ = do { -- Repeat much of lookupOccRn, becase we want
+ -- to report errors in a TH-relevant way
+ ; rdr_env <- getLocalRdrEnv
+ ; case lookupLocalRdrEnv rdr_env rdr_name of
+ Just name -> return (Just name)
+ Nothing | not (isSrcRdrName rdr_name) -- Exact, Orig
+ -> do { name <- lookupImportedName rdr_name
+ ; return (Just name) }
+ | otherwise -- Unqual, Qual
+ -> lookupSrcOcc_maybe rdr_name }
+
+ -- guessed_ns are the name spaces guessed from looking at the TH name
+ guessed_nss | isLexCon (mkFastString occ_str) = [OccName.tcName, OccName.dataName]
+ | otherwise = [OccName.varName, OccName.tvName]
occ_str = TH.occString occ
tcLookupTh :: Name -> TcM TcTyThing