rust/tests/ui/option_map_unwrap_or.rs

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// FIXME: Add "run-rustfix" once it's supported for multipart suggestions
// aux-build:option_helpers.rs
#![warn(clippy::option_map_unwrap_or, clippy::option_map_unwrap_or_else)]
#[macro_use]
extern crate option_helpers;
use std::collections::HashMap;
/// Checks implementation of the following lints:
/// * `OPTION_MAP_UNWRAP_OR`
/// * `OPTION_MAP_UNWRAP_OR_ELSE`
#[rustfmt::skip]
fn option_methods() {
let opt = Some(1);
// Check `OPTION_MAP_UNWRAP_OR`.
// 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 OPTION_MAP_UNWRAP_OR_ELSE
// single line case
let _ = opt.map(|x| x + 1)
// Should lint even though this call is on a separate line.
.unwrap_or_else(|| 0);
// Multi-line cases.
let _ = opt.map(|x| {
x + 1
}
).unwrap_or_else(|| 0);
let _ = opt.map(|x| x + 1)
.unwrap_or_else(||
0
);
// Macro case.
// Should not lint.
let _ = opt_map!(opt, |x| x + 1).unwrap_or_else(|| 0);
// Issue #4144
{
let mut frequencies = HashMap::new();
let word = "foo";
frequencies
.get_mut(word)
.map(|count| {
*count += 1;
})
.unwrap_or_else(|| {
frequencies.insert(word.to_owned(), 1);
});
}
}
fn main() {
option_methods();
}