warning: field is never read: `field_1`
  --> $DIR/issue-87987.rs:5:5
   |
LL |     field_1: u32,
   |     ^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: field is never read: `field_2`
  --> $DIR/issue-87987.rs:6:5
   |
LL |     field_2: u32,
   |     ^^^^^^^^^^^^

warning: 2 warnings emitted