1 error[E0225]: only auto traits can be used as additional traits in a trait object
4 LL | let _: Box<dyn std::io::Read + std::io::Write>;
5 | ------------- ^^^^^^^^^^^^^^
7 | | additional non-auto trait
8 | | trait alias used in trait object type (additional use)
10 | trait alias used in trait object type (first use)
12 error[E0225]: only auto traits can be used as additional traits in a trait object
13 --> $DIR/E0225.rs:8:20
15 LL | trait Foo = std::io::Read + std::io::Write;
16 | ------------- -------------- additional non-auto trait
18 | first non-auto trait
20 LL | let _: Box<dyn Foo>;
23 | trait alias used in trait object type (additional use)
24 | trait alias used in trait object type (first use)
26 error: aborting due to 2 previous errors
28 For more information about this error, try `rustc --explain E0225`.