error[E0284]: type annotations needed: cannot satisfy `the constant `use_dyn::<{_: usize}>::{constant#0}` can be evaluated` --> $DIR/object-safety-ok-infer-err.rs:20:5 | LL | use_dyn(&()); | ^^^^^^^ cannot satisfy `the constant `use_dyn::<{_: usize}>::{constant#0}` can be evaluated` | note: required by a bound in `use_dyn` --> $DIR/object-safety-ok-infer-err.rs:14:55 | LL | fn use_dyn(v: &dyn Foo) where [u8; N + 1]: Sized { | ^^^^^ required by this bound in `use_dyn` error: aborting due to previous error For more information about this error, try `rustc --explain E0284`.