- = getLclEnv `thenM` \ env ->
- let
- extra_global_tyvars = tcTyVarsOfTypes [idType id | (_,id) <- names_w_ids]
- th_lvl = thLevel (tcl_th_ctxt env)
- extra_env = [ (name, ATcId { tct_id = id,
- tct_level = th_lvl,
- tct_type = id_ty,
- tct_co = if isRefineableTy id_ty
- then Just idCoercion
- else Nothing })
- | (name,id) <- names_w_ids, let id_ty = idType id]
- le' = extendNameEnvList (tcl_env env) extra_env
- rdr_env' = extendLocalRdrEnv (tcl_rdr env) [name | (name,_) <- names_w_ids]
- in
- traceTc (text "env2") `thenM_`
- traceTc (text "env3" <+> ppr extra_env) `thenM_`
- tc_extend_gtvs (tcl_tyvars env) extra_global_tyvars `thenM` \ gtvs' ->
- (traceTc (text "env4") `thenM_`
- setLclEnv (env {tcl_env = le', tcl_tyvars = gtvs', tcl_rdr = rdr_env'}) thing_inside)
+ = do { env <- getLclEnv
+ ; tc_extend_local_id_env env (thLevel (tcl_th_ctxt env)) names_w_ids thing_inside }
+
+tcExtendGhciEnv :: [TcId] -> TcM a -> TcM a
+-- Used to bind Ids for GHCi identifiers bound earlier in the user interaction
+-- Note especially that we bind them at TH level 'impLevel'. That's because it's
+-- OK to use a variable bound earlier in the interaction in a splice, becuase
+-- GHCi has already compiled it to bytecode
+tcExtendGhciEnv ids thing_inside
+ = do { env <- getLclEnv
+ ; tc_extend_local_id_env env impLevel [(idName id, id) | id <- ids] thing_inside }
+
+tc_extend_local_id_env -- This is the guy who does the work
+ :: TcLclEnv
+ -> ThLevel
+ -> [(Name,TcId)]
+ -> TcM a -> TcM a
+-- Invariant: the TcIds are fully zonked. Reasons:
+-- (a) The kinds of the forall'd type variables are defaulted
+-- (see Kind.defaultKind, done in zonkQuantifiedTyVar)
+-- (b) There are no via-Indirect occurrences of the bound variables
+-- in the types, because instantiation does not look through such things
+-- (c) The call to tyVarsOfTypes is ok without looking through refs
+
+tc_extend_local_id_env env th_lvl names_w_ids thing_inside
+ = do { traceTc (text "env2")
+ ; traceTc (text "env3" <+> ppr extra_env)
+ ; gtvs' <- tc_extend_gtvs (tcl_tyvars env) extra_global_tyvars
+ ; let env' = env {tcl_env = le', tcl_tyvars = gtvs', tcl_rdr = rdr_env'}
+ ; setLclEnv env' thing_inside }
+ where
+ extra_global_tyvars = tcTyVarsOfTypes [idType id | (_,id) <- names_w_ids]
+ extra_env = [ (name, ATcId { tct_id = id,
+ tct_level = th_lvl,
+ tct_type = id_ty,
+ tct_co = case isRefineableTy id_ty of
+ (True,_) -> Unrefineable
+ (_,True) -> Rigid idHsWrapper
+ _ -> Wobbly})
+ | (name,id) <- names_w_ids, let id_ty = idType id]
+ le' = extendNameEnvList (tcl_env env) extra_env
+ rdr_env' = extendLocalRdrEnvList (tcl_rdr env) [name | (name,_) <- names_w_ids]