113 lines
3.0 KiB
Rust
113 lines
3.0 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
|
|
#![feature(tool_lints)]
|
|
|
|
#![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
|
|
}
|
|
}
|
|
|
|
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() {
|
|
}
|