error[E0277]: the trait bound `[Adt; _]: Foo` is not satisfied
  --> $DIR/dont-evaluate-array-len-on-err-1.rs:15:9
   |
LL |         <[Adt; std::mem::size_of::<Self::Assoc>()] as Foo>::bar()
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Foo` is not implemented for `[Adt; _]`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.