63 lines
1022 B
Rust
63 lines
1022 B
Rust
#![deny(clippy::option_option)]
|
|
|
|
fn input(_: Option<Option<u8>>) {}
|
|
|
|
fn output() -> Option<Option<u8>> {
|
|
None
|
|
}
|
|
|
|
fn output_nested() -> Vec<Option<Option<u8>>> {
|
|
vec![None]
|
|
}
|
|
|
|
// The lint only generates one warning for this
|
|
fn output_nested_nested() -> Option<Option<Option<u8>>> {
|
|
None
|
|
}
|
|
|
|
struct Struct {
|
|
x: Option<Option<u8>>,
|
|
}
|
|
|
|
impl Struct {
|
|
fn struct_fn() -> Option<Option<u8>> {
|
|
None
|
|
}
|
|
}
|
|
|
|
trait Trait {
|
|
fn trait_fn() -> Option<Option<u8>>;
|
|
}
|
|
|
|
enum Enum {
|
|
Tuple(Option<Option<u8>>),
|
|
Struct { x: Option<Option<u8>> },
|
|
}
|
|
|
|
// The lint allows this
|
|
type OptionOption = Option<Option<u32>>;
|
|
|
|
// The lint allows this
|
|
fn output_type_alias() -> OptionOption {
|
|
None
|
|
}
|
|
|
|
// The line allows this
|
|
impl Trait for Struct {
|
|
fn trait_fn() -> Option<Option<u8>> {
|
|
None
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
input(None);
|
|
output();
|
|
output_nested();
|
|
|
|
// The lint allows this
|
|
let local: Option<Option<u8>> = None;
|
|
|
|
// The lint allows this
|
|
let expr = Some(Some(true));
|
|
}
|