rust-clippy/tests/ui/option_if_let_else.rs

107 lines
2.2 KiB
Rust

// run-rustfix
#![warn(clippy::option_if_let_else)]
#![allow(clippy::redundant_closure)]
fn bad1(string: Option<&str>) -> (bool, &str) {
if let Some(x) = string {
(true, x)
} else {
(false, "hello")
}
}
fn else_if_option(string: Option<&str>) -> Option<(bool, &str)> {
if string.is_none() {
None
} else if let Some(x) = string {
Some((true, x))
} else {
Some((false, ""))
}
}
fn unop_bad(string: &Option<&str>, mut num: Option<i32>) {
let _ = if let Some(s) = *string { s.len() } else { 0 };
let _ = if let Some(s) = &num { s } else { &0 };
let _ = if let Some(s) = &mut num {
*s += 1;
s
} else {
&mut 0
};
let _ = if let Some(ref s) = num { s } else { &0 };
let _ = if let Some(mut s) = num {
s += 1;
s
} else {
0
};
let _ = if let Some(ref mut s) = num {
*s += 1;
s
} else {
&mut 0
};
}
fn longer_body(arg: Option<u32>) -> u32 {
if let Some(x) = arg {
let y = x * x;
y * y
} else {
13
}
}
fn impure_else(arg: Option<i32>) {
let side_effect = || {
println!("return 1");
1
};
let _ = if let Some(x) = arg {
x
} else {
// map_or_else must be suggested
side_effect()
};
}
fn test_map_or_else(arg: Option<u32>) {
let _ = if let Some(x) = arg {
x * x * x * x
} else {
let mut y = 1;
y = (y + 2 / y) / 2;
y = (y + 2 / y) / 2;
y
};
}
fn negative_tests(arg: Option<u32>) -> u32 {
let _ = if let Some(13) = arg { "unlucky" } else { "lucky" };
for _ in 0..10 {
let _ = if let Some(x) = arg {
x
} else {
continue;
};
}
let _ = if let Some(x) = arg {
return x;
} else {
5
};
7
}
fn main() {
let optional = Some(5);
let _ = if let Some(x) = optional { x + 2 } else { 5 };
let _ = bad1(None);
let _ = else_if_option(None);
unop_bad(&None, None);
let _ = longer_body(None);
test_map_or_else(None);
let _ = negative_tests(None);
let _ = impure_else(None);
}