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+Set Universe Polymorphism.
+
+Module Segfault.
+
+Inductive decision_tree : Type := .
+
+Fixpoint first_satisfying_helper {A B} (f : A -> option B) (ls : list A) : option B
+  := match ls with
+     | nil => None
+     | cons x xs
+       => match f x with
+          | Some v => Some v
+          | None => first_satisfying_helper f xs
+          end
+     end.
+
+Axiom admit : forall {T}, T.
+Definition dtree4 : option decision_tree :=
+  match first_satisfying_helper (fun pat : nat => Some pat) (cons 0 nil)
+  with
+  | Some _ => admit
+  | None => admit
+  end
+.
+Definition dtree'' := Eval vm_compute in dtree4. (* segfault *)
+
+End Segfault.
+
+Module OtherExample.
+
+Definition bar@{i} := Type@{i}.
+Definition foo@{i j} (x y z : nat) :=
+  @id Type@{j} bar@{i}.
+Eval vm_compute in foo.
+
+End OtherExample.
+
+Module LocalClosure.
+
+Definition bar@{i} := Type@{i}.
+
+Definition foo@{i j} (x y z : nat) :=
+  @id (nat -> Type@{j}) (fun _ => Type@{i}).
+Eval vm_compute in foo.
+
+End LocalClosure.
+
+Require Import Hurkens.
+Polymorphic Inductive unit := tt.
+
+Polymorphic Definition foo :=
+  let x := id tt in (x, x, Type).
+
+Lemma bad : False.
+  refine (TypeNeqSmallType.paradox (snd foo) _).
+  vm_compute.
+  Fail reflexivity.
+Abort.