error[E0277]: the trait bound `[Adt; std::mem::size_of::()]: Foo` is not satisfied --> $DIR/dont-evaluate-array-len-on-err-1.rs:15:9 | LL | <[Adt; std::mem::size_of::()] as Foo>::bar() | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Foo` is not implemented for `[Adt; std::mem::size_of::()]` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.