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Multiple types were used as bounds for a closure or trait object.
Erroneous code example:
```compile_fail,E0225
fn main() {
let _: Box<dyn std::io::Read + std::io::Write>;
}
```
Rust does not currently support this.
Auto traits such as Send and Sync are an exception to this rule:
It's possible to have bounds of one non-builtin trait, plus any number of
auto traits. For example, the following compiles correctly:
```
fn main() {
let _: Box<dyn std::io::Read + Send + Sync>;
}
```
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