102 lines
2.9 KiB
Rust
102 lines
2.9 KiB
Rust
#![deny(panicking_unwrap, unnecessary_unwrap)]
|
|
#![allow(if_same_then_else)]
|
|
|
|
fn main() {
|
|
let x = Some(());
|
|
if x.is_some() {
|
|
x.unwrap(); // unnecessary
|
|
} else {
|
|
x.unwrap(); // will panic
|
|
}
|
|
if x.is_none() {
|
|
x.unwrap(); // will panic
|
|
} else {
|
|
x.unwrap(); // unnecessary
|
|
}
|
|
let mut x: Result<(), ()> = Ok(());
|
|
if x.is_ok() {
|
|
x.unwrap(); // unnecessary
|
|
x.unwrap_err(); // will panic
|
|
} else {
|
|
x.unwrap(); // will panic
|
|
x.unwrap_err(); // unnecessary
|
|
}
|
|
if x.is_err() {
|
|
x.unwrap(); // will panic
|
|
x.unwrap_err(); // unnecessary
|
|
} else {
|
|
x.unwrap(); // unnecessary
|
|
x.unwrap_err(); // will panic
|
|
}
|
|
if x.is_ok() {
|
|
x = Err(());
|
|
x.unwrap(); // not unnecessary because of mutation of x
|
|
// it will always panic but the lint is not smart enoguh to see this (it only checks if conditions).
|
|
} else {
|
|
x = Ok(());
|
|
x.unwrap_err(); // not unnecessary because of mutation of x
|
|
// it will always panic but the lint is not smart enoguh to see this (it only checks if conditions).
|
|
}
|
|
}
|
|
|
|
fn test_complex_conditions() {
|
|
let x: Result<(), ()> = Ok(());
|
|
let y: Result<(), ()> = Ok(());
|
|
if x.is_ok() && y.is_err() {
|
|
x.unwrap(); // unnecessary
|
|
x.unwrap_err(); // will panic
|
|
y.unwrap(); // will panic
|
|
y.unwrap_err(); // unnecessary
|
|
} else {
|
|
// not statically determinable whether any of the following will always succeed or always fail:
|
|
x.unwrap();
|
|
x.unwrap_err();
|
|
y.unwrap();
|
|
y.unwrap_err();
|
|
}
|
|
|
|
if x.is_ok() || y.is_ok() {
|
|
// not statically determinable whether any of the following will always succeed or always fail:
|
|
x.unwrap();
|
|
y.unwrap();
|
|
} else {
|
|
x.unwrap(); // will panic
|
|
x.unwrap_err(); // unnecessary
|
|
y.unwrap(); // will panic
|
|
y.unwrap_err(); // unnecessary
|
|
}
|
|
let z: Result<(), ()> = Ok(());
|
|
if x.is_ok() && !(y.is_ok() || z.is_err()) {
|
|
x.unwrap(); // unnecessary
|
|
x.unwrap_err(); // will panic
|
|
y.unwrap(); // will panic
|
|
y.unwrap_err(); // unnecessary
|
|
z.unwrap(); // unnecessary
|
|
z.unwrap_err(); // will panic
|
|
}
|
|
if x.is_ok() || !(y.is_ok() && z.is_err()) {
|
|
// not statically determinable whether any of the following will always succeed or always fail:
|
|
x.unwrap();
|
|
y.unwrap();
|
|
z.unwrap();
|
|
} else {
|
|
x.unwrap(); // will panic
|
|
x.unwrap_err(); // unnecessary
|
|
y.unwrap(); // unnecessary
|
|
y.unwrap_err(); // will panic
|
|
z.unwrap(); // will panic
|
|
z.unwrap_err(); // unnecessary
|
|
}
|
|
}
|
|
|
|
fn test_nested() {
|
|
fn nested() {
|
|
let x = Some(());
|
|
if x.is_some() {
|
|
x.unwrap(); // unnecessary
|
|
} else {
|
|
x.unwrap(); // will panic
|
|
}
|
|
}
|
|
}
|