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Account for multiple trait bounds in bare trait object suggestion
Note the parentheses in the last suggestion: ``` error[E0277]: the size for values of type `(dyn Foo + Send + 'static)` cannot be known at compilation time --> $DIR/not-on-bare-trait.rs:7:8 | LL | fn foo(_x: Foo + Send) { | ^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `(dyn Foo + Send + 'static)` = help: unsized fn params are gated as an unstable feature help: you can use `impl Trait` as the argument type | LL | fn foo(_x: impl Foo + Send) { | ++++ help: function arguments must have a statically known size, borrowed types always have a known size | LL | fn foo(_x: &(Foo + Send)) { | ++ + ```
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