| #![warn(clippy::option_map_unit_fn)] |
| #![allow(unused)] |
| |
| fn do_nothing<T>(_: T) {} |
| |
| fn diverge<T>(_: T) -> ! { |
| panic!() |
| } |
| |
| fn plus_one(value: usize) -> usize { |
| value + 1 |
| } |
| |
| struct HasOption { |
| field: Option<usize>, |
| } |
| |
| impl HasOption { |
| fn do_option_nothing(self: &Self, value: usize) {} |
| |
| fn do_option_plus_one(self: &Self, value: usize) -> usize { |
| value + 1 |
| } |
| } |
| #[rustfmt::skip] |
| fn option_map_unit_fn() { |
| let x = HasOption { field: Some(10) }; |
| |
| x.field.map(plus_one); |
| let _ : Option<()> = x.field.map(do_nothing); |
| |
| x.field.map(do_nothing); |
| |
| x.field.map(do_nothing); |
| |
| x.field.map(diverge); |
| |
| let captured = 10; |
| if let Some(value) = x.field { do_nothing(value + captured) }; |
| let _ : Option<()> = x.field.map(|value| do_nothing(value + captured)); |
| |
| x.field.map(|value| x.do_option_nothing(value + captured)); |
| |
| x.field.map(|value| { x.do_option_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) }); |
| |
| |
| 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 Some(_X) ...` as it's difficult to generate a proper let variable name for them |
| Some(42).map(diverge); |
| "12".parse::<i32>().ok().map(diverge); |
| Some(plus_one(1)).map(do_nothing); |
| |
| // Should suggest `if let Some(_y) ...` to not override the existing foo variable |
| let y = Some(42); |
| y.map(do_nothing); |
| } |
| |
| fn main() {} |