error[E0282]: type annotations needed --> $DIR/ub-wide-ptr.rs:90:67 | LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]); | ^^^^^^^^^^^^^^ cannot infer type for type parameter `U` declared on the function `transmute` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0282`.