error[E0308]: mismatched types --> $DIR/issue-16401.rs:8:9 | LL | match () { | -- this expression has type `()` LL | Slice { data: data, len: len } => (), | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `Slice<_>` | = note: expected unit type `()` found struct `Slice<_>` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.