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#![feature(trait_alias)]
trait Foo = std::io::Read + std::io::Write;
fn main() {
let _: Box<dyn std::io::Read + std::io::Write>;
//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
let _: Box<dyn Foo>;
//~^ ERROR only auto traits can be used as additional traits in a trait object [E0225]
}
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