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Showing content from https://doc.rust-lang.org/std/ptr/fn.replace.html below:

replace in std::ptr - Rust

pub const unsafe fn replace<T>(dst: *mut T, src: T) -> T

Moves src into the pointed dst, returning the previous dst value.

Neither value is dropped.

This function is semantically equivalent to mem::replace except that it operates on raw pointers instead of references. When references are available, mem::replace should be preferred.

Behavior is undefined if any of the following conditions are violated:

• dst must be valid for both reads and writes.

• dst must be properly aligned.

• dst must point to a properly initialized value of type T.

Note that even if T has size 0, the pointer must be properly aligned.

use std::ptr;

let mut rust = vec!['b', 'u', 's', 't'];

let b = unsafe {
    ptr::replace(&mut rust[0], 'r')
};

assert_eq!(b, 'b');
assert_eq!(rust, &['r', 'u', 's', 't']);

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