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error[E0225]: only auto traits can be used as additional traits in a trait object
--> $DIR/issue-22560.rs:9:23
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LL | type Test = dyn Add + Sub;
| --- ^^^ additional non-auto trait
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| first non-auto trait
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= help: consider creating a new trait with all of these as supertraits and using that trait here instead: `trait NewTrait: Add + Sub {}`
= note: auto-traits like `Send` and `Sync` are traits that have special properties; for more information on them, visit <https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits>
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0225`.
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