lean2/tests/lean/lift_coe_off.lean

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open nat
inductive tree (A : Type) :=
leaf : A → tree A,
node : tree A → tree A → tree A
-- set_option elaborator.lift_coercions false
definition size {A : Type} (t : tree A) :nat:=
tree.rec (λ a, 1) (λ t₁ t₂ n₁ n₂, n₁ + n₂) t
--set_option elaborator.lift_coercions true
definition size2 {A : Type} (t : tree A) :nat:=
tree.rec (λ a, 1) (λ t₁ t₂ n₁ n₂, n₁ + n₂) t