--> $DIR/E0225.rs:6:36
|
LL | let _: Box<dyn std::io::Read + std::io::Write>;
- | ------------- ^^^^^^^^^^^^^^
- | | |
- | | additional non-auto trait
- | | trait alias used in trait object type (additional use)
+ | ------------- ^^^^^^^^^^^^^^ additional non-auto trait
+ | |
| first non-auto trait
- | trait alias used in trait object type (first use)
+ |
+ = help: consider creating a new trait with all of these as super-traits and using that trait here instead: `trait NewTrait: std::io::Read + std::io::Write {}`
+ = 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[E0225]: only auto traits can be used as additional traits in a trait object
--> $DIR/E0225.rs:8:20
| |
| trait alias used in trait object type (additional use)
| trait alias used in trait object type (first use)
+ |
+ = help: consider creating a new trait with all of these as super-traits and using that trait here instead: `trait NewTrait: std::io::Read + std::io::Write {}`
+ = 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 2 previous errors