| #![deny(dead_code)] |
| //~^ NOTE: the lint level is defined here |
| |
| use std::marker::PhantomData; |
| |
| const LEN: usize = 4; |
| |
| struct SingleUnused(i32, [u8; LEN], String); |
| //~^ ERROR: field `1` is never read |
| //~| NOTE: field in this struct |
| //~| HELP: consider changing the field to be of unit type |
| |
| struct MultipleUnused(i32, f32, String, u8); |
| //~^ ERROR: fields `0`, `1`, `2`, and `3` are never read |
| //~| NOTE: fields in this struct |
| //~| HELP: consider changing the fields to be of unit type |
| |
| struct GoodUnit(()); |
| |
| struct GoodPhantom(PhantomData<i32>); |
| |
| struct Void; |
| struct GoodVoid(Void); |
| |
| fn main() { |
| let w = SingleUnused(42, [0, 1, 2, 3], "abc".to_string()); |
| let _ = w.0; |
| let _ = w.2; |
| |
| let m = MultipleUnused(42, 3.14, "def".to_string(), 4u8); |
| |
| let gu = GoodUnit(()); |
| let gp = GoodPhantom(PhantomData); |
| let gv = GoodVoid(Void); |
| |
| let _ = (gu, gp, gv, m); |
| } |