lean2/tests/lean/run/univ_bug2.lean

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--- Copyright (c) 2014 Microsoft Corporation. All rights reserved.
--- Released under Apache 2.0 license as described in the file LICENSE.
--- Author: Jeremy Avigad
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import logic data.nat
open nat
-- first define a class of homogeneous equality
inductive simplifies_to [class] {T : Type} (t1 t2 : T) : Prop :=
mk : t1 = t2 → simplifies_to t1 t2
namespace simplifies_to
theorem get_eq {T : Type} {t1 t2 : T} (C : simplifies_to t1 t2) : t1 = t2 :=
simplifies_to.rec (λx, x) C
theorem simp_app [instance] (S : Type) (T : Type) (f1 f2 : S → T) (s1 s2 : S)
[C1 : simplifies_to f1 f2] [C2 : simplifies_to s1 s2] : simplifies_to (f1 s1) (f2 s2) :=
mk (congr (get_eq C1) (get_eq C2))
end simplifies_to