Regression from 1.44 to 1.45

[mcarton]

The following MVE prints 42 with rustc 1.45.0 but 13 with rustc 1.44.0

struct Foo {
    x: i32,
}

fn main() {
    let mut foo = Foo { x: 42 };
    let x = &mut foo.x;
    *x = 13;
    let y = foo;
    println!("{}", y.x); // -> 42; expected result: 13
}

Initially reported on Stack Overflow.

[mcarton]

With beta or nightly this again prints 13 as expected.

struct Foo {
    x: i32,
}

fn main() {
    let mut foo = Foo { x: 42 };

    let x = &mut foo.x;
    *x = 13;
    let y = foo;
    println!("{:?}", (&y).x);  //only added this line
    println!("{:?}", y.x); //13
}

If there is any benefit, it works as expected with this code.

[lcnr]

This is a duplicate of the already fixed #73609

It seems like this bug somehow slipped into beta :/

[SimonSapin]

@rust-lang/release Should there be a 1.45.1 with #73609?

[peterjoel]

@SimonSapin Can 1.45.0 be yanked?

[jonas-schievink]

Yanking a release is not a thing. Presumably it wouldn't do anything once the stable channel is updated anyways.

[peterjoel]

@jonas-schievink It would do something for anyone who typed rustup install 1.45.0.