151 lines
3.4 KiB
Rust
151 lines
3.4 KiB
Rust
// edition:2018
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// run-rustfix
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#![warn(clippy::option_if_let_else)]
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#![allow(clippy::redundant_closure)]
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#![allow(clippy::ref_option_ref)]
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fn bad1(string: Option<&str>) -> (bool, &str) {
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string.map_or((false, "hello"), |x| (true, x))
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}
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fn else_if_option(string: Option<&str>) -> Option<(bool, &str)> {
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if string.is_none() {
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None
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} else if let Some(x) = string {
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Some((true, x))
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} else {
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Some((false, ""))
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}
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}
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fn unop_bad(string: &Option<&str>, mut num: Option<i32>) {
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let _ = string.map_or(0, |s| s.len());
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let _ = num.as_ref().map_or(&0, |s| s);
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let _ = num.as_mut().map_or(&mut 0, |s| {
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*s += 1;
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s
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});
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let _ = num.as_ref().map_or(&0, |s| s);
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let _ = num.map_or(0, |mut s| {
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s += 1;
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s
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});
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let _ = num.as_mut().map_or(&mut 0, |s| {
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*s += 1;
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s
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});
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}
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fn longer_body(arg: Option<u32>) -> u32 {
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arg.map_or(13, |x| {
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let y = x * x;
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y * y
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})
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}
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fn impure_else(arg: Option<i32>) {
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let side_effect = || {
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println!("return 1");
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1
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};
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let _ = arg.map_or_else(|| side_effect(), |x| x);
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}
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fn test_map_or_else(arg: Option<u32>) {
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let _ = arg.map_or_else(|| {
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let mut y = 1;
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y = (y + 2 / y) / 2;
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y = (y + 2 / y) / 2;
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y
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}, |x| x * x * x * x);
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}
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fn negative_tests(arg: Option<u32>) -> u32 {
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let _ = if let Some(13) = arg { "unlucky" } else { "lucky" };
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for _ in 0..10 {
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let _ = if let Some(x) = arg {
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x
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} else {
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continue;
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};
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}
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let _ = if let Some(x) = arg {
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return x;
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} else {
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5
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};
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7
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}
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fn main() {
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let optional = Some(5);
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let _ = optional.map_or(5, |x| x + 2);
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let _ = bad1(None);
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let _ = else_if_option(None);
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unop_bad(&None, None);
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let _ = longer_body(None);
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test_map_or_else(None);
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let _ = negative_tests(None);
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let _ = impure_else(None);
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let _ = Some(0).map_or(0, |x| loop {
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if x == 0 {
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break x;
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}
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});
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// #7576
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const fn _f(x: Option<u32>) -> u32 {
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// Don't lint, `map_or` isn't const
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if let Some(x) = x { x } else { 10 }
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}
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// #5822
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let s = String::new();
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// Don't lint, `Some` branch consumes `s`, but else branch uses `s`
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let _ = if let Some(x) = Some(0) {
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let s = s;
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s.len() + x
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} else {
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s.len()
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};
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let s = String::new();
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// Lint, both branches immutably borrow `s`.
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let _ = Some(0).map_or_else(|| s.len(), |x| s.len() + x);
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let s = String::new();
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// Lint, `Some` branch consumes `s`, but else branch doesn't use `s`.
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let _ = Some(0).map_or(1, |x| {
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let s = s;
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s.len() + x
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});
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let s = Some(String::new());
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// Don't lint, `Some` branch borrows `s`, but else branch consumes `s`
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let _ = if let Some(x) = &s {
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x.len()
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} else {
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let _s = s;
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10
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};
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let mut s = Some(String::new());
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// Don't lint, `Some` branch mutably borrows `s`, but else branch also borrows `s`
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let _ = if let Some(x) = &mut s {
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x.push_str("test");
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x.len()
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} else {
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let _s = &s;
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10
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};
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async fn _f1(x: u32) -> u32 {
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x
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}
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async fn _f2() {
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// Don't lint. `await` can't be moved into a closure.
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let _ = if let Some(x) = Some(0) { _f1(x).await } else { 0 };
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}
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}
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