83 lines
1.5 KiB
Rust
83 lines
1.5 KiB
Rust
#![feature(exhaustive_patterns, never_type)]
|
|
#![allow(let_and_return)]
|
|
|
|
enum SingleVariantEnum {
|
|
Variant(i32),
|
|
}
|
|
|
|
struct TupleStruct(i32);
|
|
|
|
enum EmptyEnum {}
|
|
|
|
fn infallible_destructuring_match_enum() {
|
|
let wrapper = SingleVariantEnum::Variant(0);
|
|
|
|
// This should lint!
|
|
let data = match wrapper {
|
|
SingleVariantEnum::Variant(i) => i,
|
|
};
|
|
|
|
// This shouldn't!
|
|
let data = match wrapper {
|
|
SingleVariantEnum::Variant(_) => -1,
|
|
};
|
|
|
|
// Neither should this!
|
|
let data = match wrapper {
|
|
SingleVariantEnum::Variant(i) => -1,
|
|
};
|
|
|
|
let SingleVariantEnum::Variant(data) = wrapper;
|
|
}
|
|
|
|
fn infallible_destructuring_match_struct() {
|
|
let wrapper = TupleStruct(0);
|
|
|
|
// This should lint!
|
|
let data = match wrapper {
|
|
TupleStruct(i) => i,
|
|
};
|
|
|
|
// This shouldn't!
|
|
let data = match wrapper {
|
|
TupleStruct(_) => -1,
|
|
};
|
|
|
|
// Neither should this!
|
|
let data = match wrapper {
|
|
TupleStruct(i) => -1,
|
|
};
|
|
|
|
let TupleStruct(data) = wrapper;
|
|
}
|
|
|
|
fn never_enum() {
|
|
let wrapper: Result<i32, !> = Ok(23);
|
|
|
|
// This should lint!
|
|
let data = match wrapper {
|
|
Ok(i) => i,
|
|
};
|
|
|
|
// This shouldn't!
|
|
let data = match wrapper {
|
|
Ok(_) => -1,
|
|
};
|
|
|
|
// Neither should this!
|
|
let data = match wrapper {
|
|
Ok(i) => -1,
|
|
};
|
|
|
|
let Ok(data) = wrapper;
|
|
}
|
|
|
|
impl EmptyEnum {
|
|
fn match_on(&self) -> ! {
|
|
// The lint shouldn't pick this up, as `let` won't work here!
|
|
let data = match *self {};
|
|
data
|
|
}
|
|
}
|
|
|
|
fn main() {}
|