+tcExtendGlobalValEnv :: [Id] -> TcM a -> TcM a
+tcExtendGlobalValEnv ids thing_inside
+ = tcGetEnv `thenNF_Tc` \ env ->
+ let
+ ge' = extendTypeEnvWithIds (tcGEnv env) ids
+ in
+ tcSetEnv (env {tcGEnv = ge'}) thing_inside
+\end{code}
+
+
+\begin{code}
+tcLookupGlobal_maybe :: Name -> NF_TcM (Maybe TyThing)
+tcLookupGlobal_maybe name
+ = tcGetEnv `thenNF_Tc` \ env ->
+ returnNF_Tc (lookup_global env name)
+\end{code}
+
+A variety of global lookups, when we know what we are looking for.
+
+\begin{code}
+tcLookupGlobal :: Name -> NF_TcM TyThing
+tcLookupGlobal name
+ = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_thing ->
+ case maybe_thing of
+ Just thing -> returnNF_Tc thing
+ other -> notFound "tcLookupGlobal" name
+
+tcLookupGlobalId :: Name -> NF_TcM Id
+tcLookupGlobalId name
+ = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_id ->
+ case maybe_id of
+ Just (AnId id) -> returnNF_Tc id
+ other -> notFound "tcLookupGlobalId" name
+
+tcLookupDataCon :: Name -> TcM DataCon
+tcLookupDataCon con_name
+ = tcLookupGlobalId con_name `thenNF_Tc` \ con_id ->
+ case isDataConWrapId_maybe con_id of
+ Just data_con -> returnTc data_con
+ Nothing -> failWithTc (badCon con_id)
+
+
+tcLookupClass :: Name -> NF_TcM Class
+tcLookupClass name
+ = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_clas ->
+ case maybe_clas of
+ Just (AClass clas) -> returnNF_Tc clas
+ other -> notFound "tcLookupClass" name
+
+tcLookupTyCon :: Name -> NF_TcM TyCon
+tcLookupTyCon name
+ = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_tc ->
+ case maybe_tc of
+ Just (ATyCon tc) -> returnNF_Tc tc
+ other -> notFound "tcLookupTyCon" name
+
+tcLookupId :: Name -> NF_TcM Id
+tcLookupId name
+ = tcLookup name `thenNF_Tc` \ thing ->
+ case thing of
+ ATcId tc_id -> returnNF_Tc tc_id
+ AGlobal (AnId id) -> returnNF_Tc id
+ other -> pprPanic "tcLookupId" (ppr name)
+
+tcLookupLocalIds :: [Name] -> NF_TcM [TcId]
+tcLookupLocalIds ns
+ = tcGetEnv `thenNF_Tc` \ env ->
+ returnNF_Tc (map (lookup (tcLEnv env)) ns)
+ where
+ lookup lenv name = case lookupNameEnv lenv name of
+ Just (ATcId id) -> id
+ other -> pprPanic "tcLookupLocalIds" (ppr name)