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error[E0277]: the size for values of type `(dyn I + 'static)` cannot be known at compilation time
--> $DIR/issue-5035-2.rs:4:8
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LL | fn foo(_x: K) {}
| ^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn I + 'static)`
= help: unsized fn params are gated as an unstable feature
help: you can use `impl Trait` as the argument type
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LL | fn foo(_x: impl K) {}
| ++++
help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn foo(_x: &K) {}
| +
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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