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+(* Checking that the "in" clause takes the "eqn" clause into account *)
+
+Definition test (x: nat): {y: nat | False }. Admitted.
+
+Parameter x: nat.
+Parameter z: nat.
+
+Goal
+  proj1_sig (test x) = z ->
+  False.
+Proof.
+  intro H.
+  destruct (test x) eqn:Heqs in H.
+  change (test x = exist (fun _ : nat => False) x0 f) in Heqs. (* Check it has the expected statement *)
+Abort.