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if-let-guards.rs
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if-let-guards.rs
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// Check the if let guards don't force capture by value
//@ revisions: e2018 e2021
//@ check-pass
//@[e2018] edition:2018
//@[e2021] edition:2021
#![feature(if_let_guard)]
#![allow(irrefutable_let_patterns)]
fn if_let_underscore(value: Box<E>) {
|x: &E| {
match &x {
E::Number(_) if let _ = *value => { }
_ => {}
}
};
let x = value;
}
fn if_let_copy(value: Box<E>) {
|x: &E| {
match &x {
E::Number(_) if let E::Number(n) = *value => { }
_ => {}
}
};
let x = value;
}
fn if_let_ref(value: Box<E>) {
|x: &E| {
match &x {
E::Number(_) if let E::Number(ref n) = *value => { }
_ => {}
}
};
let x = value;
}
fn if_let_ref_mut(mut value: Box<E>) {
|x: &E| {
match &x {
E::Number(_) if let E::Number(ref mut n) = *value => { }
_ => {}
}
};
let x = value;
}
enum E {
String(String),
Number(i32),
}
fn main() {}