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//@ revisions: stable2021 classic2021 structural2021 classic2024 structural2024
//@[stable2021] edition: 2021
//@[classic2021] edition: 2021
//@[structural2021] edition: 2021
//@[classic2024] edition: 2024
//@[structural2024] edition: 2024
//@ dont-require-annotations: NOTE
//! Tests for pattern errors not handled by the pattern typing rules, but by borrowck.
#![allow(incomplete_features)]
#![cfg_attr(any(classic2021, classic2024), feature(ref_pat_eat_one_layer_2024))]
#![cfg_attr(any(structural2021, structural2024), feature(ref_pat_eat_one_layer_2024_structural))]
/// These patterns additionally use `&` to match a `&mut` reference type, which causes compilation
/// to fail in HIR typeck on stable. As such, they need to be separate from the other tests.
fn errors_caught_in_hir_typeck_on_stable() {
let [&x] = &[&mut 0];
//[stable2021]~^ ERROR mismatched types
//[stable2021]~| NOTE types differ in mutability
//[classic2024]~^^^ ERROR: cannot move out of type
#[cfg(any(classic2021, structural2021))] let _: u32 = x;
#[cfg(structural2024)] let _: &u32 = x;
let [&x] = &mut [&mut 0];
//[stable2021]~^ ERROR mismatched types
//[stable2021]~| NOTE types differ in mutability
//[classic2024]~^^^ ERROR: cannot move out of type
#[cfg(any(classic2021, structural2021))] let _: u32 = x;
#[cfg(structural2024)] let _: &u32 = x;
}
pub fn main() {
if let Some(&Some(x)) = Some(&Some(&mut 0)) {
//~^ ERROR: cannot move out of a shared reference [E0507]
let _: &u32 = x;
}
let &ref mut x = &0;
//~^ ERROR cannot borrow data in a `&` reference as mutable [E0596]
// For 2021 edition, this is also a regression test for #136223
// since the maximum mutability is downgraded during the pattern check process.
if let &Some(Some(x)) = &Some(&mut Some(0)) {
//[stable2021,classic2021,classic2024]~^ ERROR: cannot borrow data in a `&` reference as mutable
#[cfg(any(structural2021, structural2024))] let _: &u32 = x;
}
let &[x] = &&mut [0];
//[stable2021,classic2021,classic2024]~^ ERROR: cannot borrow data in a `&` reference as mutable
#[cfg(any(structural2021, structural2024))] let _: &u32 = x;
let [&mut x] = &mut [&mut 0];
//[classic2024]~^ ERROR: cannot move out of type
#[cfg(any(stable2021, classic2021, structural2021))] let _: u32 = x;
#[cfg(structural2024)] let _: &mut u32 = x;
}
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