diff options
Diffstat (limited to 'compiler/GHC/Tc/Module.hs')
| -rw-r--r-- | compiler/GHC/Tc/Module.hs | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/compiler/GHC/Tc/Module.hs b/compiler/GHC/Tc/Module.hs index dfc867c80a..08f7d0f4b1 100644 --- a/compiler/GHC/Tc/Module.hs +++ b/compiler/GHC/Tc/Module.hs @@ -491,9 +491,10 @@ tcRnSrcDecls explicit_mod_hdr decls export_ies ; (bind_env_mf, ev_binds_mf, binds_mf, fords_mf, imp_specs_mf, rules_mf) <- zonkTcGblEnv emptyBag tcg_env_mf - - ; let { final_type_env = plusTypeEnv (tcg_type_env tcg_env) - (plusTypeEnv bind_env_mf bind_env) + -- Force this or we retain an old reference to the previous + -- tcg_env + ; let { !final_type_env = plusTypeEnv (tcg_type_env tcg_env) + (plusTypeEnv bind_env_mf bind_env) ; tcg_env' = tcg_env_mf { tcg_binds = binds' `unionBags` binds_mf, tcg_ev_binds = ev_binds' `unionBags` ev_binds_mf , |