error[E0204]: the trait `Copy` may not be implemented for this type
  --> $DIR/all_missing.rs:5:1
   |
5  | / bitflags! {
6  | |     struct Flags128: MyInt {
7  | |         const A = MyInt(0b0000_0001);
8  | |         const B = MyInt(0b0000_0010);
9  | |         const C = MyInt(0b0000_0100);
10 | |     }
11 | | }
   | |_^ this field does not implement `Copy`
   |
   = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info)