| #![feature(never_type)] |
| #![warn(clippy::result_map_unit_fn)] |
| #![allow(unused)] |
| |
| fn do_nothing<T>(_: T) {} |
| |
| fn diverge<T>(_: T) -> ! { |
| panic!() |
| } |
| |
| fn plus_one(value: usize) -> usize { |
| value + 1 |
| } |
| |
| #[rustfmt::skip] |
| fn result_map_unit_fn() { |
| x.field.map(|value| { do_nothing(value); do_nothing(value) }); |
| |
| x.field.map(|value| if value > 0 { do_nothing(value); do_nothing(value) }); |
| |
| // Suggestion for the let block should be `{ ... }` as it's too difficult to build a |
| // proper suggestion for these cases |
| x.field.map(|value| { |
| do_nothing(value); |
| do_nothing(value) |
| }); |
| x.field.map(|value| { do_nothing(value); do_nothing(value); }); |
| |
| // The following should suggest `if let Ok(_X) ...` as it's difficult to generate a proper let variable name for them |
| let res: Result<!, usize> = Ok(42).map(diverge); |
| "12".parse::<i32>().map(diverge); |
| |
| let res: Result<(), usize> = Ok(plus_one(1)).map(do_nothing); |
| |
| // Should suggest `if let Ok(_y) ...` to not override the existing foo variable |
| let y: Result<usize, usize> = Ok(42); |
| y.map(do_nothing); |
| } |
| |
| fn main() {} |