(* This lemma ought to be generated automatically by the Inversion tools *)
#[deprecated(since="8.3", note="Use mergesort.v")]

Lemma is_heap_rect :
forall P:Tree -> Type,
P Tree_Leaf ->
(forall (a:A) (T1 T2:Tree),
leA_Tree a T1 ->
leA_Tree a T2 ->
is_heap T1 -> P T1 -> is_heap T2 -> P T2 -> P (Tree_Node a T1 T2)) ->
forall T:Tree, is_heap T -> P T.