error[E0308]: mismatched types --> $DIR/issue-67945-1.rs:10:20 | LL | struct Bug { | - expected this type parameter ... LL | let x: S = MaybeUninit::uninit(); | - ^^^^^^^^^^^^^^^^^^^^^ expected type parameter `S`, found `MaybeUninit<_>` | | | expected due to this | = note: expected type parameter `S` found union `MaybeUninit<_>` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.