diff options
Diffstat (limited to 'plugins/subtac/eterm.ml')
| -rw-r--r-- | plugins/subtac/eterm.ml | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/plugins/subtac/eterm.ml b/plugins/subtac/eterm.ml index 5ed335d0..f4d8b769 100644 --- a/plugins/subtac/eterm.ml +++ b/plugins/subtac/eterm.ml @@ -132,18 +132,29 @@ let rec chop_product n t = | Prod (_, _, b) -> if noccurn 1 b then chop_product (pred n) (Termops.pop b) else None | _ -> None -let evar_dependencies evm ev = +let evars_of_evar_info evi = + Intset.union (Evarutil.evars_of_term evi.evar_concl) + (Intset.union + (match evi.evar_body with + | Evar_empty -> Intset.empty + | Evar_defined b -> Evarutil.evars_of_term b) + (Evarutil.evars_of_named_context (evar_filtered_context evi))) + +let evar_dependencies evm oev = let one_step deps = Intset.fold (fun ev s -> let evi = Evd.find evm ev in - Intset.union (Evarutil.evars_of_evar_info evi) s) + let deps' = evars_of_evar_info evi in + if Intset.mem oev deps' then + raise (Invalid_argument ("Ill-formed evar map: cycle detected for evar " ^ string_of_int oev)) + else Intset.union deps' s) deps deps in let rec aux deps = let deps' = one_step deps in if Intset.equal deps deps' then deps else aux deps' - in aux (Intset.singleton ev) + in aux (Intset.singleton oev) let move_after (id, ev, deps as obl) l = let rec aux restdeps = function |