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On recursive ADT, provide indirection structured suggestion
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1 error[E0072]: recursive type `Foo` has infinite size
2   --> $DIR/issue-17431-7.rs:1:1
3    |
4 LL | enum Foo { Voo(Option<Option<Foo>>) }
5    | ^^^^^^^^       ------------------- recursive without indirection
6    | |
7    | recursive type has infinite size
8    |
9 help: insert some indirection to make `Foo` representable
10    |
11 LL | enum Foo { Voo(Box<Option<Option<Foo>>>) }
12    |                ^^^^                   ^
13 LL | enum Foo { Voo(Rc<Option<Option<Foo>>>) }
14    |                ^^^                   ^
15 LL | enum Foo { Voo(&Option<Option<Foo>>) }
16    |                ^
17
18 error: aborting due to previous error
19
20 For more information about this error, try `rustc --explain E0072`.