error[E0641]: cannot cast to a pointer of an unknown kind --> $DIR/issue-45730.rs:3:28 | LL | let x: *const _ = 0 as _; | ^ needs more type information | = note: the type information given here is insufficient to check whether the pointer cast is valid error[E0641]: cannot cast to a pointer of an unknown kind --> $DIR/issue-45730.rs:5:28 | LL | let x: *const _ = 0 as *const _; | ^^^^^^^^ needs more type information | = note: the type information given here is insufficient to check whether the pointer cast is valid error[E0641]: cannot cast to a pointer of an unknown kind --> $DIR/issue-45730.rs:8:44 | LL | let x = 0 as *const i32 as *const _ as *mut _; | ^^^^^^ needs more type information | = note: the type information given here is insufficient to check whether the pointer cast is valid error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0641`.