1 error[E0308]: mismatched types
5 | ^ expected trait `Foo + Send`, found trait `Foo + Sync`
7 = note: expected struct `Box<(dyn Foo + Send + 'static)>`
8 found struct `Box<(dyn Foo + Sync + 'static)>`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0308`.