1 #![feature(never_type)]
2 #![warn(clippy::result_map_unit_fn)]
5 fn do_nothing<T>(_: T) {}
7 fn diverge<T>(_: T) -> ! {
11 fn plus_one(value: usize) -> usize {
16 fn result_map_unit_fn() {
17 x.field.map(|value| { do_nothing(value); do_nothing(value) });
19 x.field.map(|value| if value > 0 { do_nothing(value); do_nothing(value) });
21 // Suggestion for the let block should be `{ ... }` as it's too difficult to build a
22 // proper suggestion for these cases
27 x.field.map(|value| { do_nothing(value); do_nothing(value); });
29 // The following should suggest `if let Ok(_X) ...` as it's difficult to generate a proper let variable name for them
30 let res: Result<!, usize> = Ok(42).map(diverge);
31 "12".parse::<i32>().map(diverge);
33 let res: Result<(), usize> = Ok(plus_one(1)).map(do_nothing);
35 // Should suggest `if let Ok(_y) ...` to not override the existing foo variable
36 let y: Result<usize, usize> = Ok(42);