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error[E0599]: no method named `len` found for struct `Wrapper<T>` in the current scope
--> $DIR/deref-constrains-self-ty.rs:22:32
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LL | struct Wrapper<T>(T);
| ----------------- method `len` not found for this struct
...
LL | let _ = Wrapper(foo()).len();
| ^^^ method not found in `Wrapper<impl Sized>`
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= help: items from traits can only be used if the trait is implemented and in scope
= note: the following trait defines an item `len`, perhaps you need to implement it:
candidate #1: `ExactSizeIterator`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0599`.
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