diff --git a/tests/lean/run/new_compiler.lean b/tests/lean/run/new_compiler.lean
new file mode 100644
index 0000000000..31cd38e737
--- /dev/null
+++ b/tests/lean/run/new_compiler.lean
@@ -0,0 +1,119 @@
+import init.lean.parser.parsec
+import init.control.coroutine
+universes u v w r s
+
+set_option trace.compiler.lcnf true
+-- set_option pp.implicit true
+set_option pp.binder_types false
+
+def foo (n : nat) : nat :=
+let x := nat.zero in
+let x_1 := nat.succ x in
+let x_2 := nat.succ x_1 in
+let x_3 := nat.succ x_2 in
+let x_4 := nat.succ x_3 in
+let x_5 := nat.succ x_4 in
+let x_6 := nat.succ x_5 in
+let x_7 := nat.succ x   in
+let x_8 := nat.succ x_7 in
+x + n
+
+def tst1 (n : nat) : nat :=
+let p := (nat.succ n, n) in
+let q := (p, p) in
+prod.cases_on q (λ x y, prod.cases_on x (λ z w, z))
+
+def tst2 (n : nat) : nat :=
+let p := (λ x, nat.succ x, nat.zero)  in
+let f := λ p : (nat → nat) × nat, p.1 in
+f p n
+
+def add' : nat → nat → nat
+| 0 b     := nat.succ b
+| (a+1) b := nat.succ (nat.succ (add' a b))
+
+namespace lean
+namespace parser
+namespace monad_parsec
+open parsec_t
+
+variables {μ : Type}
+variables {m : Type → Type} [monad m] [monad_parsec μ m] [inhabited μ] {α β : Type}
+
+@[inline] def label' (p : m α) (ex : string) : m α :=
+map (λ m' inst β p, @parsec_t.label m' inst μ β p ex) p
+
+open parsec
+
+def longest_match' [monad_except (message μ) m] (ps : list (m α)) : m (list α) :=
+do it ← left_over,
+   r ← ps.mfoldr (λ p (r : result μ (list α)),
+     lookahead $ catch
+       (do
+         a ← p,
+         it ← left_over,
+         pure $ match r with
+         | result.ok as it' := if it'.offset > it.offset then r
+             else if it.offset > it'.offset then result.ok [a] it
+             else result.ok (a::as) it
+         | _                := result.ok [a] it)
+       (λ msg, pure $ match r with
+           | result.error msg' _ := if nat.lt msg.it.offset msg'.it.offset then r -- FIXME
+             else if nat.lt msg'.it.offset msg.it.offset then result.error msg tt
+             else result.error (merge msg msg') tt
+           | _ := r))
+    ((error "longest_match: empty list" : parsec _ _) it),
+    lift $ λ _, r
+
+end monad_parsec
+end parser
+end lean
+
+def aux (i : nat) (h : i > 0) :=
+i
+
+def foo2 : nat :=
+@false.rec (λ _, nat) sorry
+
+set_option pp.notation false
+
+def foo3 (n : nat) : nat :=
+(λ a : nat, a + a + a) (n*n)
+
+def boo (a : nat) (l : list nat) : list nat :=
+let f := @list.cons nat in
+f a (f a l)
+
+def bla (i : nat) (h : i > 0 ∧ i ≠ 10) : nat :=
+@and.rec _ _ (λ _, nat) (λ h₁ h₂, aux i h₁ + aux i h₁) h
+
+def bla' (i : nat) (h : i > 0 ∧ i ≠ 10) : nat :=
+@and.cases_on _ _ (λ _, nat) h (λ h₁ h₂, aux i h₁ + aux i h₁)
+
+inductive vec (α : Type u) : nat → Type u
+| nil {}  : vec 0
+| cons    : Π {n}, α → vec n → vec (nat.succ n)
+
+def vec.map {α β σ : Type u} (f : α → β → σ) : Π {n : nat}, vec α n → vec β n → vec σ n
+| _ vec.nil vec.nil                 := vec.nil
+| _ (vec.cons a as) (vec.cons b bs) := vec.cons (f a b) (vec.map as bs)
+
+namespace coroutine
+variables {α : Type u} {δ : Type v} {β γ : Type w}
+
+def pipe2 : coroutine α δ β → coroutine δ γ β → coroutine α γ β
+| (mk k₁) (mk k₂) := mk $ λ a,
+  match k₁ a, rfl : ∀ (n : _), n = k₁ a → _ with
+  | done b, h        := done b
+  | yielded d k₁', h :=
+    match k₂ d with
+    | done b        := done b
+    | yielded r k₂' :=
+      -- have direct_subcoroutine k₁' (mk k₁), { apply direct_subcoroutine.mk k₁ a d, rw h },
+      yielded r (pipe2 k₁' k₂')
+
+end coroutine
+
+set_option pp.all true
+set_option pp.binder_types true
+#check @lc_cast