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diff --git a/test-suite/output/inference.v b/test-suite/output/inference.v
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+(* Check that types are not uselessly unfolded *)
+
+(* Check here that P returns something of type "option L" and not
+   "option (list nat)" *)
+
+Definition L := list nat.
+
+Definition P (e:option L) :=
+  match e with
+  | None => None
+  | Some cl => Some cl
+  end.
+
+Print P.
+
+(* Check that the heuristic to solve constraints is not artificially
+   dependent on the presence of a let-in, and in particular that the
+   second [_] below is not inferred to be n, as if obtained by
+   first-order unification with [T n] of the conclusion [T _] of the
+   type of the first [_]. *)
+
+(* Note: exact numbers of evars are not important... *)
+
+Inductive T (n:nat) : Type := A : T n.
+Check fun n (x:=A n:T n) => _ _ : T n.
+Check fun n => _ _ : T n.