--- find_globals looks at the value environment and finds values
--- whose types mention the offending type variable. It has to be
--- careful to zonk the Id's type first, so it has to be in the monad.
--- We must be careful to pass it a zonked type variable, too.
-
-find_globals :: Var
- -> TidyEnv
- -> [TcTyThing]
- -> NF_TcM (TidyEnv, [SDoc])
-
-find_globals tv tidy_env things
- = go tidy_env [] things
- where
- go tidy_env acc [] = returnNF_Tc (tidy_env, acc)
- go tidy_env acc (thing : things)
- = find_thing ignore_it tidy_env thing `thenNF_Tc` \ (tidy_env1, maybe_doc) ->
- case maybe_doc of
- Just d -> go tidy_env1 (d:acc) things
- Nothing -> go tidy_env1 acc things
-
- ignore_it ty = not (tv `elemVarSet` tyVarsOfType ty)
-
------------------------
-find_thing ignore_it tidy_env (ATcId id)
- = zonkTcType (idType id) `thenNF_Tc` \ id_ty ->
- if ignore_it id_ty then
- returnNF_Tc (tidy_env, Nothing)
- else let
- (tidy_env', tidy_ty) = tidyOpenType tidy_env id_ty
- msg = sep [ppr id <+> dcolon <+> ppr tidy_ty,
- nest 2 (parens (ptext SLIT("bound at") <+>
- ppr (getSrcLoc id)))]
- in
- returnNF_Tc (tidy_env', Just msg)
-
-find_thing ignore_it tidy_env (ATyVar tv)
- = zonkTcTyVar tv `thenNF_Tc` \ tv_ty ->
- if ignore_it tv_ty then
- returnNF_Tc (tidy_env, Nothing)
- else let
- (tidy_env1, tv1) = tidyOpenTyVar tidy_env tv
- (tidy_env2, tidy_ty) = tidyOpenType tidy_env1 tv_ty
- msg = sep [ppr tv1 <+> eq_stuff, nest 2 bound_at]
-
- eq_stuff | Just tv' <- Type.getTyVar_maybe tv_ty, tv == tv' = empty
- | otherwise = equals <+> ppr tv_ty
- -- It's ok to use Type.getTyVar_maybe because ty is zonked by now
-
- bound_at = tyVarBindingInfo tv
- in
- returnNF_Tc (tidy_env2, Just msg)
-
------------------------