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// RUN: /compile:1
abstract module Interface {
type T
function F(): T
predicate P(x: T)
lemma FP()
ensures P(F())
}
module Implementation refines Interface {
predicate P(x: T) {
false
abstract module User {
import I : Interface
lemma Main()
ensures I.P(I.F());
{
I.FP();
assert I.P(I.F());
module Main refines User {
import I = Implementation
ensures I.P(I.F())
assert false;
