Cannot combine two lines in one when RwLock is used

Question

I am experimenting with Rust and ran into something very unexpected.

If I wrap state in a RwLock, then I cannot combine two statements using this state into a single one. If I remove the RwLock and use state directly, this works.

use parking_lot::{RwLock};

pub struct State {
    pub current: u8,
    pub history: Vec<u8>,
}

fn main() {
    let locked = RwLock::new(
        State {
            current: 10,
            history: Vec::new(),
        });
    // type: lock_api::rwlock::RwLockWriteGuard<parking_lot::raw_rwlock::RawRwLock, playground::State>
    let mut state = locked.write();

    // Works as two statements
    let old = std::mem::replace(&mut state.current, 5);
    state.history.push(old);

    // Fails as one statement
    // Error: cannot borrow `state` as mutable more than once at a time
    state.history.push(std::mem::replace(
        &mut state.current, 
        5,
    ));
}

Can someone explain what is happening?

EDIT: I have seen answers like Error while trying to borrow 2 fields from a struct wrapped in RefCell. This is not the same question! This is about code that becomes invalid if and only if two statements are nested. Something that I have only seen in Rust and no other language.

This artifaft also only appears when an RwLock is used.