Set Implicit Arguments.
Require qs_definitions.
Require qs_parts.
Require U.
Section contents.
Variables (ee: E) (ol: list ee).

Lemma NeTree_In_Node_inv (A: Set) (r: A) (l: ne_list.L (ne_tree.T A)):
ne_tree.In r (ne_tree.Node l) -> ne_tree.InL r l.