diff options
Diffstat (limited to 'compiler/GHC/Tc/Utils/Zonk.hs')
| -rw-r--r-- | compiler/GHC/Tc/Utils/Zonk.hs | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/compiler/GHC/Tc/Utils/Zonk.hs b/compiler/GHC/Tc/Utils/Zonk.hs index 4d4860c7e1..90717063f7 100644 --- a/compiler/GHC/Tc/Utils/Zonk.hs +++ b/compiler/GHC/Tc/Utils/Zonk.hs @@ -946,21 +946,31 @@ zonkExpr env expr@(RecordCon { rcon_ext = con_expr, rcon_flds = rbinds }) ; return (expr { rcon_ext = new_con_expr , rcon_flds = new_rbinds }) } -zonkExpr env (RecordUpd { rupd_flds = rbinds +-- Record updates via dot syntax are replaced by desugared expressions +-- in the renamer. See Note [Rebindable Syntax and HsExpansion]. This +-- is why we match on 'rupd_flds = Left rbinds' here and panic otherwise. +zonkExpr env (RecordUpd { rupd_flds = Left rbinds , rupd_expr = expr - , rupd_ext = RecordUpdTc - { rupd_cons = cons, rupd_in_tys = in_tys - , rupd_out_tys = out_tys, rupd_wrap = req_wrap }}) + , rupd_ext = RecordUpdTc { + rupd_cons = cons + , rupd_in_tys = in_tys + , rupd_out_tys = out_tys + , rupd_wrap = req_wrap }}) = do { new_expr <- zonkLExpr env expr ; new_in_tys <- mapM (zonkTcTypeToTypeX env) in_tys ; new_out_tys <- mapM (zonkTcTypeToTypeX env) out_tys ; new_rbinds <- zonkRecUpdFields env rbinds ; (_, new_recwrap) <- zonkCoFn env req_wrap - ; return (RecordUpd { rupd_expr = new_expr, rupd_flds = new_rbinds - , rupd_ext = RecordUpdTc - { rupd_cons = cons, rupd_in_tys = new_in_tys - , rupd_out_tys = new_out_tys - , rupd_wrap = new_recwrap }}) } + ; return ( + RecordUpd { + rupd_expr = new_expr + , rupd_flds = Left new_rbinds + , rupd_ext = RecordUpdTc { + rupd_cons = cons + , rupd_in_tys = new_in_tys + , rupd_out_tys = new_out_tys + , rupd_wrap = new_recwrap }}) } +zonkExpr _ (RecordUpd {}) = panic "GHC.Tc.Utils.Zonk: zonkExpr: The impossible happened!" zonkExpr env (ExprWithTySig _ e ty) = do { e' <- zonkLExpr env e |