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Inductive A: Set :=
| A1: nat -> A.
Definition A_size (a: A) : nat :=
match a with
| A1 n => 0
end.
Require Import Recdef.
Function n3 (P: A -> Prop) (f: forall n, P (A1 n)) (a: A) {struct a} : P a :=
match a return (P a) with
| A1 n => f n
end.
Function n1 (P: A -> Prop) (f: forall n, P (A1 n)) (a: A) {measure A_size a} :
P
a :=
match a return (P a) with
| A1 n => f n
end.
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