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error: invalid `?` in type
--> $DIR/infinite-assoc.rs:12:39
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LL | struct A((A, <S as Trait>::T<NOT_EXIST?>));
| ^ `?` is only allowed on expressions, not types
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help: if you meant to express that the type might not contain a value, use the `Option` wrapper type
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LL - struct A((A, <S as Trait>::T<NOT_EXIST?>));
LL + struct A((A, <S as Trait>::T<Option<NOT_EXIST>>));
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error[E0072]: recursive type `A` has infinite size
--> $DIR/infinite-assoc.rs:12:1
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LL | struct A((A, <S as Trait>::T<NOT_EXIST?>));
| ^^^^^^^^ - recursive without indirection
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help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
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LL | struct A((Box<A>, <S as Trait>::T<NOT_EXIST?>));
| ++++ +
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0072`.
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