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compose S
: (nat -> nat) -> nat -> nat
ex_intro (P:=fun _ : nat => True) (x:=0) I
: ex (fun _ : nat => True)
d2 = fun x : nat => d1 (y:=x)
: forall x x0 : nat, x0 = x -> x0 = x
Arguments d2 [x x0]%nat_scope
map id (1 :: nil)
: list nat
map id' (1 :: nil)
: list nat
map (id'' (A:=nat)) (1 :: nil)
: list nat
fix f (x : nat) : option nat := match x with
| 0 => None
| S _ => x
end
: nat -> option nat
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