// run-rustfix #![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 } struct HasResult { field: Result<usize, usize>, } impl HasResult { fn do_result_nothing(&self, value: usize) {} fn do_result_plus_one(&self, value: usize) -> usize { value + 1 } } #[rustfmt::skip] fn result_map_unit_fn() { let x = HasResult { field: Ok(10) }; x.field.map(plus_one); let _: Result<(), usize> = x.field.map(do_nothing); x.field.map(do_nothing); x.field.map(do_nothing); x.field.map(diverge); let captured = 10; if let Ok(value) = x.field { do_nothing(value + captured) }; let _: Result<(), usize> = x.field.map(|value| do_nothing(value + captured)); x.field.map(|value| x.do_result_nothing(value + captured)); x.field.map(|value| { x.do_result_plus_one(value + captured); }); x.field.map(|value| do_nothing(value + captured)); x.field.map(|value| { do_nothing(value + captured) }); x.field.map(|value| { do_nothing(value + captured); }); x.field.map(|value| { { do_nothing(value + captured); } }); x.field.map(|value| diverge(value + captured)); x.field.map(|value| { diverge(value + captured) }); x.field.map(|value| { diverge(value + captured); }); x.field.map(|value| { { diverge(value + captured); } }); x.field.map(|value| plus_one(value + captured)); x.field.map(|value| { plus_one(value + captured) }); x.field.map(|value| { let y = plus_one(value + captured); }); x.field.map(|value| { plus_one(value + captured); }); x.field.map(|value| { { plus_one(value + captured); } }); x.field.map(|ref value| { do_nothing(value + captured) }); } fn main() {}