1 error[E0308]: mismatched types
2 --> $DIR/issue-68295.rs:43:5
4 LL | fn crash<R, C>(input: Matrix<R, C, ()>) -> Matrix<R, C, u32>
5 | ----------------- expected `Matrix<R, C, u32>` because of return type
7 LL | input.into_owned()
8 | ^^^^^^^^^^^^^^^^^^ expected `u32`, found associated type
10 = note: expected struct `Matrix<_, _, u32>`
11 found struct `Matrix<_, _, <() as Allocator<R, C>>::Buffer>`
12 = help: consider constraining the associated type `<() as Allocator<R, C>>::Buffer` to `u32`
13 = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
15 error: aborting due to previous error
17 For more information about this error, try `rustc --explain E0308`.