error[E0277]: the size for values of type `[isize]` cannot be known at compilation time
  --> $DIR/dst-sized-trait-param.rs:7:6
   |
LL | trait Foo<T> : Sized { fn take(self, x: &T) { } } // Note: T is sized
   |           - required by this bound in `Foo`
LL | 
LL | impl Foo<[isize]> for usize { }
   |      ^^^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `[isize]`
help: consider relaxing the implicit `Sized` restriction
   |
LL | trait Foo<T: ?Sized> : Sized { fn take(self, x: &T) { } } // Note: T is sized
   |            ^^^^^^^^

error[E0277]: the size for values of type `[usize]` cannot be known at compilation time
  --> $DIR/dst-sized-trait-param.rs:10:6
   |
LL | trait Foo<T> : Sized { fn take(self, x: &T) { } } // Note: T is sized
   |                ----- required by this bound in `Foo`
...
LL | impl Foo<isize> for [usize] { }
   |      ^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `[usize]`

error: aborting due to 2 previous errors

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