\begin{code}
module RdrName (
- RdrName,
+ RdrName(..), -- Constructors exported only to BinIface
-- Construction
- mkRdrUnqual, mkRdrQual, mkRdrOrig, mkRdrUnqual,
- mkUnqual, mkQual, mkIfaceOrig, mkOrig,
- qualifyRdrName, unqualifyRdrName, mkRdrNameWkr,
- dummyRdrVarName, dummyRdrTcName,
+ mkRdrUnqual, mkRdrQual,
+ mkUnqual, mkVarUnqual, mkQual, mkOrig,
+ nameRdrName, getRdrName,
+ mkDerivedRdrName,
-- Destruction
- rdrNameModule, rdrNameOcc, setRdrNameOcc,
- isRdrDataCon, isRdrTyVar, isQual, isUnqual, isOrig,
-
- -- Environment
- RdrNameEnv,
- emptyRdrEnv, lookupRdrEnv, addListToRdrEnv, rdrEnvElts,
- extendRdrEnv, rdrEnvToList, elemRdrEnv, foldRdrEnv,
+ rdrNameModule, rdrNameOcc, setRdrNameSpace,
+ isRdrDataCon, isRdrTyVar, isRdrTc, isQual, isUnqual,
+ isOrig, isOrig_maybe, isExact, isExact_maybe, isSrcRdrName,
-- Printing; instance Outputable RdrName
- pprUnqualRdrName
+
+ -- LocalRdrEnv
+ LocalRdrEnv, emptyLocalRdrEnv, extendLocalRdrEnv,
+ lookupLocalRdrEnv, elemLocalRdrEnv,
+
+ -- GlobalRdrEnv
+ GlobalRdrEnv, emptyGlobalRdrEnv, mkGlobalRdrEnv, plusGlobalRdrEnv,
+ lookupGlobalRdrEnv, pprGlobalRdrEnv, globalRdrEnvElts,
+ lookupGRE_RdrName, lookupGRE_Name,
+
+ -- GlobalRdrElt, Provenance, ImportSpec
+ GlobalRdrElt(..), Provenance(..), ImportSpec(..),
+ isLocalGRE, unQualOK,
+ pprNameProvenance
) where
#include "HsVersions.h"
-import OccName ( NameSpace, tcName,
- OccName, UserFS, EncodedFS,
- mkSysOccFS,
- mkOccFS, mkVarOcc,
- isDataOcc, isTvOcc, mkWorkerOcc
- )
-import Module ( ModuleName,
- mkSysModuleNameFS, mkModuleNameFS
+import OccName ( NameSpace, varName,
+ OccName, UserFS,
+ setOccNameSpace,
+ mkOccFS, occNameFlavour,
+ isDataOcc, isTvOcc, isTcOcc,
+ OccEnv, emptyOccEnv, extendOccEnvList, lookupOccEnv,
+ elemOccEnv, plusOccEnv_C, extendOccEnv_C, foldOccEnv,
+ occEnvElts
)
-import FiniteMap
+import Module ( Module, mkModuleFS )
+import Name ( Name, NamedThing(getName), nameModule, nameParent_maybe,
+ nameOccName, isExternalName, nameSrcLoc )
+import SrcLoc ( isGoodSrcLoc, SrcSpan )
import Outputable
import Util ( thenCmp )
\end{code}
%************************************************************************
\begin{code}
-data RdrName = RdrName Qual OccName
-
-data Qual = Unqual
-
- | Qual ModuleName -- A qualified name written by the user in source code
- -- The module isn't necessarily the module where
- -- the thing is defined; just the one from which it
- -- is imported
-
- | Orig ModuleName -- This is an *original* name; the module is the place
- -- where the thing was defined
+data RdrName
+ = Unqual OccName
+ -- Used for ordinary, unqualified occurrences
+
+ | Qual Module OccName
+ -- A qualified name written by the user in
+ -- *source* code. The module isn't necessarily
+ -- the module where the thing is defined;
+ -- just the one from which it is imported
+
+ | Orig Module OccName
+ -- An original name; the module is the *defining* module.
+ -- This is used when GHC generates code that will be fed
+ -- into the renamer (e.g. from deriving clauses), but where
+ -- we want to say "Use Prelude.map dammit".
+
+ | Exact Name
+ -- We know exactly the Name. This is used
+ -- (a) when the parser parses built-in syntax like "[]"
+ -- and "(,)", but wants a RdrName from it
+ -- (b) when converting names to the RdrNames in IfaceTypes
+ -- Here an Exact RdrName always contains an External Name
+ -- (Internal Names are converted to simple Unquals)
+ -- (c) by Template Haskell, when TH has generated a unique name
\end{code}
%************************************************************************
\begin{code}
-rdrNameModule :: RdrName -> ModuleName
-rdrNameModule (RdrName (Qual m) _) = m
-rdrNameModule (RdrName (Orig m) _) = m
+rdrNameModule :: RdrName -> Module
+rdrNameModule (Qual m _) = m
+rdrNameModule (Orig m _) = m
+rdrNameModule (Exact n) = nameModule n
+rdrNameModule (Unqual n) = pprPanic "rdrNameModule" (ppr n)
rdrNameOcc :: RdrName -> OccName
-rdrNameOcc (RdrName _ occ) = occ
-
-setRdrNameOcc :: RdrName -> OccName -> RdrName
-setRdrNameOcc (RdrName q _) occ = RdrName q occ
+rdrNameOcc (Qual _ occ) = occ
+rdrNameOcc (Unqual occ) = occ
+rdrNameOcc (Orig _ occ) = occ
+rdrNameOcc (Exact name) = nameOccName name
+
+setRdrNameSpace :: RdrName -> NameSpace -> RdrName
+-- This rather gruesome function is used mainly by the parser
+-- When parsing data T a = T | T1 Int
+-- we parse the data constructors as *types* because of parser ambiguities,
+-- so then we need to change the *type constr* to a *data constr*
+--
+-- The original-name case *can* occur when parsing
+-- data [] a = [] | a : [a]
+-- For the orig-name case we return an unqualified name.
+setRdrNameSpace (Unqual occ) ns = Unqual (setOccNameSpace ns occ)
+setRdrNameSpace (Qual m occ) ns = Qual m (setOccNameSpace ns occ)
+setRdrNameSpace (Orig m occ) ns = Orig m (setOccNameSpace ns occ)
+setRdrNameSpace (Exact n) ns = Orig (nameModule n)
+ (setOccNameSpace ns (nameOccName n))
\end{code}
\begin{code}
-- These two are the basic constructors
mkRdrUnqual :: OccName -> RdrName
-mkRdrUnqual occ = RdrName Unqual occ
+mkRdrUnqual occ = Unqual occ
-mkRdrQual :: ModuleName -> OccName -> RdrName
-mkRdrQual mod occ = RdrName (Qual mod) occ
+mkRdrQual :: Module -> OccName -> RdrName
+mkRdrQual mod occ = Qual mod occ
-mkRdrOrig :: ModuleName -> OccName -> RdrName
-mkRdrOrig mod occ = RdrName (Orig mod) occ
-
-mkIfaceOrig :: NameSpace -> (EncodedFS, EncodedFS) -> RdrName
-mkIfaceOrig ns (m,n) = RdrName (Orig (mkSysModuleNameFS m)) (mkSysOccFS ns n)
+mkOrig :: Module -> OccName -> RdrName
+mkOrig mod occ = Orig mod occ
+---------------
+mkDerivedRdrName :: Name -> (OccName -> OccName) -> (RdrName)
+mkDerivedRdrName parent mk_occ
+ = mkOrig (nameModule parent) (mk_occ (nameOccName parent))
+---------------
-- These two are used when parsing source files
-- They do encode the module and occurrence names
mkUnqual :: NameSpace -> UserFS -> RdrName
-mkUnqual sp n = RdrName Unqual (mkOccFS sp n)
+mkUnqual sp n = Unqual (mkOccFS sp n)
-mkQual :: NameSpace -> (UserFS, UserFS) -> RdrName
-mkQual sp (m, n) = RdrName (Qual (mkModuleNameFS m)) (mkOccFS sp n)
+mkVarUnqual :: UserFS -> RdrName
+mkVarUnqual n = Unqual (mkOccFS varName n)
-mkOrig :: NameSpace -> ModuleName -> UserFS -> RdrName
-mkOrig sp mod n = RdrName (Orig mod) (mkOccFS sp n)
+mkQual :: NameSpace -> (UserFS, UserFS) -> RdrName
+mkQual sp (m, n) = Qual (mkModuleFS m) (mkOccFS sp n)
-qualifyRdrName :: ModuleName -> RdrName -> RdrName
- -- Sets the module name of a RdrName, even if it has one already
-qualifyRdrName mod (RdrName _ occ) = RdrName (Qual mod) occ
+getRdrName :: NamedThing thing => thing -> RdrName
+getRdrName name = nameRdrName (getName name)
-unqualifyRdrName :: RdrName -> RdrName
-unqualifyRdrName (RdrName _ occ) = RdrName Unqual occ
+nameRdrName :: Name -> RdrName
+nameRdrName name = Exact name
+-- Keep the Name even for Internal names, so that the
+-- unique is still there for debug printing, particularly
+-- of Types (which are converted to IfaceTypes before printing)
-mkRdrNameWkr :: RdrName -> RdrName -- Worker-ify it
-mkRdrNameWkr (RdrName qual occ) = RdrName qual (mkWorkerOcc occ)
+nukeExact :: Name -> RdrName
+nukeExact n
+ | isExternalName n = Orig (nameModule n) (nameOccName n)
+ | otherwise = Unqual (nameOccName n)
\end{code}
\begin{code}
- -- This guy is used by the reader when HsSyn has a slot for
- -- an implicit name that's going to be filled in by
- -- the renamer. We can't just put "error..." because
- -- we sometimes want to print out stuff after reading but
- -- before renaming
-dummyRdrVarName = RdrName Unqual (mkVarOcc SLIT("V-DUMMY"))
-dummyRdrTcName = RdrName Unqual (mkOccFS tcName SLIT("TC-DUMMY"))
-\end{code}
+isRdrDataCon rn = isDataOcc (rdrNameOcc rn)
+isRdrTyVar rn = isTvOcc (rdrNameOcc rn)
+isRdrTc rn = isTcOcc (rdrNameOcc rn)
+isSrcRdrName (Unqual _) = True
+isSrcRdrName (Qual _ _) = True
+isSrcRdrName _ = False
-\begin{code}
-isRdrDataCon (RdrName _ occ) = isDataOcc occ
-isRdrTyVar (RdrName _ occ) = isTvOcc occ
+isUnqual (Unqual _) = True
+isUnqual other = False
+
+isQual (Qual _ _) = True
+isQual _ = False
-isUnqual (RdrName Unqual _) = True
-isUnqual other = False
+isOrig (Orig _ _) = True
+isOrig _ = False
-isQual (RdrName (Qual _) _) = True
-isQual _ = False
+isOrig_maybe (Orig m n) = Just (m,n)
+isOrig_maybe _ = Nothing
-isOrig (RdrName (Orig _) _) = True
-isOrig other = False
+isExact (Exact _) = True
+isExact other = False
+
+isExact_maybe (Exact n) = Just n
+isExact_maybe other = Nothing
\end{code}
\begin{code}
instance Outputable RdrName where
- ppr (RdrName qual occ) = pp_qual qual <> ppr occ
- where
- pp_qual Unqual = empty
- pp_qual (Qual mod) = ppr mod <> dot
- pp_qual (Orig mod) = ppr mod <> dot
+ ppr (Exact name) = ppr name
+ ppr (Unqual occ) = ppr occ <+> ppr_name_space occ
+ ppr (Qual mod occ) = ppr mod <> dot <> ppr occ <+> ppr_name_space occ
+ ppr (Orig mod occ) = ppr mod <> dot <> ppr occ <+> ppr_name_space occ
+
+ppr_name_space occ = ifPprDebug (parens (occNameFlavour occ))
-pprUnqualRdrName (RdrName qual occ) = ppr occ
+instance OutputableBndr RdrName where
+ pprBndr _ n
+ | isTvOcc (rdrNameOcc n) = char '@' <+> ppr n
+ | otherwise = ppr n
instance Eq RdrName where
- a == b = case (a `compare` b) of { EQ -> True; _ -> False }
- a /= b = case (a `compare` b) of { EQ -> False; _ -> True }
+ (Exact n1) == (Exact n2) = n1==n2
+ -- Convert exact to orig
+ (Exact n1) == r2@(Orig _ _) = nukeExact n1 == r2
+ r1@(Orig _ _) == (Exact n2) = r1 == nukeExact n2
+
+ (Orig m1 o1) == (Orig m2 o2) = m1==m2 && o1==o2
+ (Qual m1 o1) == (Qual m2 o2) = m1==m2 && o1==o2
+ (Unqual o1) == (Unqual o2) = o1==o2
+ r1 == r2 = False
instance Ord RdrName where
a <= b = case (a `compare` b) of { LT -> True; EQ -> True; GT -> False }
a >= b = case (a `compare` b) of { LT -> False; EQ -> True; GT -> True }
a > b = case (a `compare` b) of { LT -> False; EQ -> False; GT -> True }
- compare (RdrName q1 o1) (RdrName q2 o2)
- = (o1 `compare` o2) `thenCmp`
- (q1 `cmpQual` q2)
+ -- Exact < Unqual < Qual < Orig
+ -- [Note: Apr 2004] We used to use nukeExact to convert Exact to Orig
+ -- before comparing so that Prelude.map == the exact Prelude.map, but
+ -- that meant that we reported duplicates when renaming bindings
+ -- generated by Template Haskell; e.g
+ -- do { n1 <- newName "foo"; n2 <- newName "foo";
+ -- <decl involving n1,n2> }
+ -- I think we can do without this conversion
+ compare (Exact n1) (Exact n2) = n1 `compare` n2
+ compare (Exact n1) n2 = LT
+
+ compare (Unqual _) (Exact _) = GT
+ compare (Unqual o1) (Unqual o2) = o1 `compare` o2
+ compare (Unqual _) _ = LT
+
+ compare (Qual _ _) (Exact _) = GT
+ compare (Qual _ _) (Unqual _) = GT
+ compare (Qual m1 o1) (Qual m2 o2) = (o1 `compare` o2) `thenCmp` (m1 `compare` m2)
+ compare (Qual _ _) (Orig _ _) = LT
+
+ compare (Orig m1 o1) (Orig m2 o2) = (o1 `compare` o2) `thenCmp` (m1 `compare` m2)
+ compare (Orig _ _) _ = GT
+\end{code}
+
+
-cmpQual Unqual Unqual = EQ
-cmpQual (Qual m1) (Qual m2) = m1 `compare` m2
-cmpQual (Orig m1) (Orig m2) = m1 `compare` m2
-cmpQual Unqual _ = LT
-cmpQual (Qual _) (Orig _) = LT
-cmpQual _ _ = GT
+%************************************************************************
+%* *
+ LocalRdrEnv
+%* *
+%************************************************************************
+
+A LocalRdrEnv is used for local bindings (let, where, lambda, case)
+It is keyed by OccName, because we never use it for qualified names.
+
+\begin{code}
+type LocalRdrEnv = OccEnv Name
+
+emptyLocalRdrEnv = emptyOccEnv
+
+extendLocalRdrEnv :: LocalRdrEnv -> [Name] -> LocalRdrEnv
+extendLocalRdrEnv env names
+ = extendOccEnvList env [(nameOccName n, n) | n <- names]
+
+lookupLocalRdrEnv :: LocalRdrEnv -> RdrName -> Maybe Name
+lookupLocalRdrEnv env (Exact name) = Just name
+lookupLocalRdrEnv env (Unqual occ) = lookupOccEnv env occ
+lookupLocalRdrEnv env other = Nothing
+
+elemLocalRdrEnv :: RdrName -> LocalRdrEnv -> Bool
+elemLocalRdrEnv rdr_name env
+ | isUnqual rdr_name = rdrNameOcc rdr_name `elemOccEnv` env
+ | otherwise = False
\end{code}
+%************************************************************************
+%* *
+ GlobalRdrEnv
+%* *
+%************************************************************************
+
+\begin{code}
+type GlobalRdrEnv = OccEnv [GlobalRdrElt]
+ -- Keyed by OccName; when looking up a qualified name
+ -- we look up the OccName part, and then check the Provenance
+ -- to see if the appropriate qualification is valid. This
+ -- saves routinely doubling the size of the env by adding both
+ -- qualified and unqualified names to the domain.
+ --
+ -- The list in the range is reqd because there may be name clashes
+ -- These only get reported on lookup, not on construction
+
+ -- INVARIANT: All the members of the list have distinct
+ -- gre_name fields; that is, no duplicate Names
+
+emptyGlobalRdrEnv = emptyOccEnv
+
+globalRdrEnvElts :: GlobalRdrEnv -> [GlobalRdrElt]
+globalRdrEnvElts env = foldOccEnv (++) [] env
+
+data GlobalRdrElt
+ = GRE { gre_name :: Name,
+ gre_prov :: Provenance -- Why it's in scope
+ }
+
+instance Outputable GlobalRdrElt where
+ ppr gre = ppr name <+> pp_parent (nameParent_maybe name)
+ <+> parens (pprNameProvenance gre)
+ where
+ name = gre_name gre
+ pp_parent (Just p) = brackets (text "parent:" <+> ppr p)
+ pp_parent Nothing = empty
+
+pprGlobalRdrEnv :: GlobalRdrEnv -> SDoc
+pprGlobalRdrEnv env
+ = vcat (map pp (occEnvElts env))
+ where
+ pp gres = ppr (nameOccName (gre_name (head gres))) <> colon <+>
+ vcat [ ppr (gre_name gre) <+> pprNameProvenance gre
+ | gre <- gres]
+\end{code}
+
+\begin{code}
+lookupGlobalRdrEnv :: GlobalRdrEnv -> OccName -> [GlobalRdrElt]
+lookupGlobalRdrEnv env rdr_name = case lookupOccEnv env rdr_name of
+ Nothing -> []
+ Just gres -> gres
+
+lookupGRE_RdrName :: RdrName -> GlobalRdrEnv -> [GlobalRdrElt]
+lookupGRE_RdrName rdr_name env
+ = case lookupOccEnv env occ of
+ Nothing -> []
+ Just gres | isUnqual rdr_name -> filter unQualOK gres
+ | otherwise -> filter (hasQual mod) gres
+ where
+ mod = rdrNameModule rdr_name
+ occ = rdrNameOcc rdr_name
+
+lookupGRE_Name :: GlobalRdrEnv -> Name -> [GlobalRdrElt]
+lookupGRE_Name env name
+ = [ gre | gre <- lookupGlobalRdrEnv env (nameOccName name),
+ gre_name gre == name ]
+
+
+isLocalGRE :: GlobalRdrElt -> Bool
+isLocalGRE (GRE {gre_prov = LocalDef _}) = True
+isLocalGRE other = False
+
+unQualOK :: GlobalRdrElt -> Bool
+-- An unqualifed version of this thing is in scope
+unQualOK (GRE {gre_prov = LocalDef _}) = True
+unQualOK (GRE {gre_prov = Imported is _}) = not (all is_qual is)
+
+hasQual :: Module -> GlobalRdrElt -> Bool
+-- A qualified version of this thing is in scope
+hasQual mod (GRE {gre_prov = LocalDef m}) = m == mod
+hasQual mod (GRE {gre_prov = Imported is _}) = any ((== mod) . is_as) is
+
+plusGlobalRdrEnv :: GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
+plusGlobalRdrEnv env1 env2 = plusOccEnv_C (foldr insertGRE) env1 env2
+
+mkGlobalRdrEnv :: [GlobalRdrElt] -> GlobalRdrEnv
+mkGlobalRdrEnv gres
+ = foldr add emptyGlobalRdrEnv gres
+ where
+ add gre env = extendOccEnv_C (foldr insertGRE) env
+ (nameOccName (gre_name gre))
+ [gre]
+
+insertGRE :: GlobalRdrElt -> [GlobalRdrElt] -> [GlobalRdrElt]
+insertGRE new_g [] = [new_g]
+insertGRE new_g (old_g : old_gs)
+ | gre_name new_g == gre_name old_g
+ = new_g `plusGRE` old_g : old_gs
+ | otherwise
+ = old_g : insertGRE new_g old_gs
+
+plusGRE :: GlobalRdrElt -> GlobalRdrElt -> GlobalRdrElt
+-- Used when the gre_name fields match
+plusGRE g1 g2
+ = GRE { gre_name = gre_name g1,
+ gre_prov = gre_prov g1 `plusProv` gre_prov g2 }
+\end{code}
+
%************************************************************************
%* *
-\subsection{Environment}
+ Provenance
%* *
%************************************************************************
+The "provenance" of something says how it came to be in scope.
+
+\begin{code}
+data Provenance
+ = LocalDef -- Defined locally
+ Module
+
+ | Imported -- Imported
+ [ImportSpec] -- INVARIANT: non-empty
+ Bool -- True iff the thing was named *explicitly*
+ -- in *any* of the import specs rather than being
+ -- imported as part of a group;
+ -- e.g.
+ -- import B
+ -- import C( T(..) )
+ -- Here, everything imported by B, and the constructors of T
+ -- are not named explicitly; only T is named explicitly.
+ -- This info is used when warning of unused names.
+
+data ImportSpec -- Describes a particular import declaration
+ -- Shared among all the Provenaces for a particular
+ -- import declaration
+ = ImportSpec {
+ is_mod :: Module, -- 'import Muggle'
+ -- Note the Muggle may well not be
+ -- the defining module for this thing!
+ is_as :: Module, -- 'as M' (or 'Muggle' if there is no 'as' clause)
+ is_qual :: Bool, -- True <=> qualified (only)
+ is_loc :: SrcSpan } -- Location of import statment
+
+-- Comparison of provenance is just used for grouping
+-- error messages (in RnEnv.warnUnusedBinds)
+instance Eq Provenance where
+ p1 == p2 = case p1 `compare` p2 of EQ -> True; _ -> False
+
+instance Eq ImportSpec where
+ p1 == p2 = case p1 `compare` p2 of EQ -> True; _ -> False
+
+instance Ord Provenance where
+ compare (LocalDef _) (LocalDef _) = EQ
+ compare (LocalDef _) (Imported _ _) = LT
+ compare (Imported _ _) (LocalDef _) = GT
+ compare (Imported is1 _) (Imported is2 _) = compare (head is1) (head is2)
+
+instance Ord ImportSpec where
+ compare is1 is2 = (is_mod is1 `compare` is_mod is2) `thenCmp`
+ (is_loc is1 `compare` is_loc is2)
+\end{code}
+
\begin{code}
-type RdrNameEnv a = FiniteMap RdrName a
-
-emptyRdrEnv :: RdrNameEnv a
-lookupRdrEnv :: RdrNameEnv a -> RdrName -> Maybe a
-addListToRdrEnv :: RdrNameEnv a -> [(RdrName,a)] -> RdrNameEnv a
-extendRdrEnv :: RdrNameEnv a -> RdrName -> a -> RdrNameEnv a
-rdrEnvToList :: RdrNameEnv a -> [(RdrName, a)]
-rdrEnvElts :: RdrNameEnv a -> [a]
-elemRdrEnv :: RdrName -> RdrNameEnv a -> Bool
-foldRdrEnv :: (RdrName -> a -> b -> b) -> b -> RdrNameEnv a -> b
-
-emptyRdrEnv = emptyFM
-lookupRdrEnv = lookupFM
-addListToRdrEnv = addListToFM
-rdrEnvElts = eltsFM
-extendRdrEnv = addToFM
-rdrEnvToList = fmToList
-elemRdrEnv = elemFM
-foldRdrEnv = foldFM
+plusProv :: Provenance -> Provenance -> Provenance
+-- Choose LocalDef over Imported
+-- There is an obscure bug lurking here; in the presence
+-- of recursive modules, something can be imported *and* locally
+-- defined, and one might refer to it with a qualified name from
+-- the import -- but I'm going to ignore that because it makes
+-- the isLocalGRE predicate so much nicer this way
+plusProv (LocalDef m1) (LocalDef m2)
+ = pprPanic "plusProv" (ppr m1 <+> ppr m2)
+plusProv p1@(LocalDef _) p2 = p1
+plusProv p1 p2@(LocalDef _) = p2
+plusProv (Imported is1 ex1) (Imported is2 ex2)
+ = Imported (is1++is2) (ex1 || ex2)
+
+pprNameProvenance :: GlobalRdrElt -> SDoc
+pprNameProvenance (GRE {gre_name = name, gre_prov = LocalDef _})
+ = ptext SLIT("defined at") <+> ppr (nameSrcLoc name)
+pprNameProvenance (GRE {gre_name = name, gre_prov = Imported (why:whys) _})
+ = sep [ppr why, nest 2 (ppr_defn (nameSrcLoc name))]
+
+-- If we know the exact definition point (which we may do with GHCi)
+-- then show that too. But not if it's just "imported from X".
+ppr_defn loc | isGoodSrcLoc loc = parens (ptext SLIT("defined at") <+> ppr loc)
+ | otherwise = empty
+
+instance Outputable ImportSpec where
+ ppr imp_spec
+ = ptext SLIT("imported from") <+> ppr (is_mod imp_spec)
+ <+> ptext SLIT("at") <+> ppr (is_loc imp_spec)
\end{code}
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