lean4-htt/tests/lean/run/457.lean
Leonardo de Moura ea45d3bd40 fix: fixes #457
2021-05-12 20:45:54 -07:00

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axiom f {α : Type} : List α → List α
theorem t (a : α) (as : List α) : f (a :: as) = as :=
sorry
theorem tt {a : α} {as : List α} : f (a :: as) = as :=
by simp [t _ as]