lean2/tests/lean/run/e14.lean

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inductive nat : Type :=
| zero : nat
| succ : nat → nat
inductive list (A : Type) : Type :=
| nil {} : list A
| cons : A → list A → list A
check nil
check nil.{1}
check @nil.{1} nat
check @nil nat
check cons zero nil
inductive vector (A : Type) : nat → Type :=
| vnil {} : vector A zero
| vcons : forall {n : nat}, A → vector A n → vector A (succ n)
check vcons zero vnil
variable n : nat
check vcons n vnil
check vector_rec
definition vector_to_list {A : Type} {n : nat} (v : vector A n) : list A
:= vector_rec (@nil A) (fun (n : nat) (a : A) (v : vector A n) (l : list A), cons a l) v
coercion vector_to_list
variable f : forall {A : Type}, list A → nat
check f (cons zero nil)
check f (vcons zero vnil)