lean2/tests/lean/run/inv_bug2.lean

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import data.vector
open nat
namespace vector
variables {A : Type} {n : nat}
protected definition destruct2 (v : vector A (succ (succ n))) {P : Π {n : nat}, vector A (succ n) → Type}
(H : Π {n : nat} (h : A) (t : vector A n), P (h :: t)) : P v :=
begin
cases v with (n', h', t'),
apply (H h' t')
end
end vector