#[global]
 Instance MapsTo_compat {elt} :
   Proper (D.eq==>Logic.eq==>equivlistA eqke==>iff) (@MapsTo elt).#[global]
 Instance In_compat {elt} : Proper (D.eq==>equivlistA eqk==>iff) (@In elt).

Lemma In_inv_2 {elt} k k' e e' (l:list (key*elt)) : InA eqk (k, e) ((k', e') :: l) -> ~ D.eq k k' -> InA eqk (k, e) l.