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error[E0404]: expected trait, found type alias `Foo`
--> $DIR/issue-3907.rs:11:6
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LL | impl Foo for S {
| ^^^ type aliases cannot be used as traits
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help: you might have meant to use `#![feature(trait_alias)]` instead of a `type` alias
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LL - type Foo = dyn issue_3907::Foo;
LL + trait Foo = dyn issue_3907::Foo;
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help: consider importing this trait instead
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LL + use issue_3907::Foo;
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error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0404`.
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