error: `0 as *const _` detected. Consider using `ptr::null()` --> $DIR/zero_ptr.rs:6:13 | 6 | let x = 0 as *const usize; | ^^^^^^^^^^^^^^^^^ | = note: `-D zero-ptr` implied by `-D warnings` error: `0 as *mut _` detected. Consider using `ptr::null_mut()` --> $DIR/zero_ptr.rs:7:13 | 7 | let y = 0 as *mut f64; | ^^^^^^^^^^^^^