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// aux-build:option_helpers.rs
#![warn(clippy::map_unwrap_or)]
#[macro_use]
extern crate option_helpers;
use std::collections::HashMap;
#[rustfmt::skip]
fn option_methods() {
let opt = Some(1);
// Check for `option.map(_).unwrap_or(_)` use.
// Single line case.
let _ = opt.map(|x| x + 1)
// Should lint even though this call is on a separate line.
.unwrap_or(0);
// Multi-line cases.
let _ = opt.map(|x| {
x + 1
}
).unwrap_or(0);
let _ = opt.map(|x| x + 1)
.unwrap_or({
0
});
// Single line `map(f).unwrap_or(None)` case.
let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
// Multi-line `map(f).unwrap_or(None)` cases.
let _ = opt.map(|x| {
Some(x + 1)
}
).unwrap_or(None);
let _ = opt
.map(|x| Some(x + 1))
.unwrap_or(None);
// macro case
let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
// Should not lint if not copyable
let id: String = "identifier".to_string();
let _ = Some("prefix").map(|p| format!("{}.{}", p, id)).unwrap_or(id);
// ...but DO lint if the `unwrap_or` argument is not used in the `map`
let id: String = "identifier".to_string();
let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id);
// Check for `option.map(_).unwrap_or_else(_)` use.
// Multi-line cases.
let _ = opt.map(|x| {
x + 1
}
).unwrap_or_else(|| 0);
let _ = opt.map(|x| x + 1)
.unwrap_or_else(||
0
);
}
#[rustfmt::skip]
fn result_methods() {
let res: Result<i32, ()> = Ok(1);
// Check for `result.map(_).unwrap_or_else(_)` use.
// multi line cases
let _ = res.map(|x| {
x + 1
}
).unwrap_or_else(|_e| 0);
let _ = res.map(|x| x + 1)
.unwrap_or_else(|_e| {
0
});
// macro case
let _ = opt_map!(res, |x| x + 1).unwrap_or_else(|_e| 0); // should not lint
}
fn main() {
option_methods();
result_methods();
}
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