error[E0641]: cannot cast to a pointer of an unknown kind --> $DIR/issue-45730.rs:3:23 | LL | let x: *const _ = 0 as _; | ^^^^^- | | | help: consider giving 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:5:23 | LL | let x: *const _ = 0 as *const _; | ^^^^^-------- | | | help: consider giving 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:8:13 | LL | let x = 0 as *const i32 as *const _ as *mut _; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------ | | | help: consider giving 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