error[E0609]: no field `b` on type `Foo`
  --> $DIR/issue-24365.rs:10:22
   |
LL |     println!("{}", a.b);
   |                      ^ unknown field

error[E0609]: no field `attr_name_idx` on type `&Attribute`
  --> $DIR/issue-24365.rs:17:18
   |
LL |     let z = (&x).attr_name_idx;
   |                  ^^^^^^^^^^^^^ unknown field

error[E0609]: no field `attr_name_idx` on type `Attribute`
  --> $DIR/issue-24365.rs:18:15
   |
LL |     let y = x.attr_name_idx;
   |               ^^^^^^^^^^^^^ unknown field

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0609`.