75 lines
1.5 KiB
Rust
75 lines
1.5 KiB
Rust
#![warn(clippy::match_ref_pats)]
|
|
|
|
fn ref_pats() {
|
|
{
|
|
let v = &Some(0);
|
|
match v {
|
|
&Some(v) => println!("{:?}", v),
|
|
&None => println!("none"),
|
|
}
|
|
match v {
|
|
// This doesn't trigger; we have a different pattern.
|
|
&Some(v) => println!("some"),
|
|
other => println!("other"),
|
|
}
|
|
}
|
|
let tup = &(1, 2);
|
|
match tup {
|
|
&(v, 1) => println!("{}", v),
|
|
_ => println!("none"),
|
|
}
|
|
// Special case: using `&` both in expr and pats.
|
|
let w = Some(0);
|
|
match &w {
|
|
&Some(v) => println!("{:?}", v),
|
|
&None => println!("none"),
|
|
}
|
|
// False positive: only wildcard pattern.
|
|
let w = Some(0);
|
|
#[allow(clippy::match_single_binding)]
|
|
match w {
|
|
_ => println!("none"),
|
|
}
|
|
|
|
let a = &Some(0);
|
|
if let &None = a {
|
|
println!("none");
|
|
}
|
|
|
|
let b = Some(0);
|
|
if let &None = &b {
|
|
println!("none");
|
|
}
|
|
}
|
|
|
|
mod ice_3719 {
|
|
macro_rules! foo_variant(
|
|
($idx:expr) => (Foo::get($idx).unwrap())
|
|
);
|
|
|
|
enum Foo {
|
|
A,
|
|
B,
|
|
}
|
|
|
|
impl Foo {
|
|
fn get(idx: u8) -> Option<&'static Self> {
|
|
match idx {
|
|
0 => Some(&Foo::A),
|
|
1 => Some(&Foo::B),
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
fn ice_3719() {
|
|
// ICE #3719
|
|
match foo_variant!(0) {
|
|
&Foo::A => println!("A"),
|
|
_ => println!("Wild"),
|
|
}
|
|
}
|
|
}
|
|
|
|
fn main() {}
|