diff options
Diffstat (limited to 'pretyping')
-rw-r--r-- | pretyping/evarsolve.ml | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/pretyping/evarsolve.ml b/pretyping/evarsolve.ml index 62700aef3..338ac4300 100644 --- a/pretyping/evarsolve.ml +++ b/pretyping/evarsolve.ml @@ -212,30 +212,29 @@ let restrict_instance evd evk filter argsv = open Context.Rel.Declaration let noccur_evar env evd evk c = let cache = ref Int.Set.empty (* cache for let-ins *) in - let rec occur_rec (k, env as acc) c = + let rec occur_rec check_types (k, env as acc) c = match kind_of_term c with | Evar (evk',args' as ev') -> (match safe_evar_value evd ev' with - | Some c -> occur_rec acc c + | Some c -> occur_rec check_types acc c | None -> if Evar.equal evk evk' then raise Occur - else Array.iter (occur_rec acc) args') + else (if check_types then + occur_rec false acc (existential_type evd ev'); + Array.iter (occur_rec check_types acc) args')) | Rel i when i > k -> - if not (Int.Set.mem (i-k) !cache) then - (match Environ.lookup_rel i env with - | LocalAssum _ -> () - | LocalDef (_,b,_) -> cache := Int.Set.add (i-k) !cache; occur_rec acc (lift i b)) - | Proj (p,c) -> - let c = - try Retyping.expand_projection env evd p c [] - with Retyping.RetypeError _ -> - (* Can happen when called from w_unify which doesn't assign evars/metas - eagerly enough *) c - in occur_rec acc c + if not (Int.Set.mem (i-k) !cache) then + let decl = Environ.lookup_rel i env in + if check_types then + (cache := Int.Set.add (i-k) !cache; occur_rec false acc (lift i (get_type decl))); + (match decl with + | LocalAssum _ -> () + | LocalDef (_,b,_) -> cache := Int.Set.add (i-k) !cache; occur_rec false acc (lift i b)) + | Proj (p,c) -> occur_rec true acc c | _ -> iter_constr_with_full_binders (fun rd (k,env) -> (succ k, push_rel rd env)) - occur_rec acc c + (occur_rec check_types) acc c in - try occur_rec (0,env) c; true with Occur -> false + try occur_rec false (0,env) c; true with Occur -> false (***************************************) (* Managing chains of local definitons *) |