shared_cell 0.5.0

Interior mutability between concurrent tasks on the same thread
Documentation 
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use core::pin::pin;

use shared_cell::SharedCell;

struct Context {
    stuff: u32,
}

fn main() {
    let mut context = Context { stuff: 42 };
    let mut context = pin!(SharedCell::new(&mut context));

    context.with(|cx| {
        println!("Before: {}", cx.stuff);
        cx.stuff += 1;
        println!("After: {}", cx.stuff);

        // Doesn't compile
        context.with(|cx| {
            println!("Before: {}", cx.stuff);
            cx.stuff += 1;
            println!("After: {}", cx.stuff);
        });
    });

    context.with(|cx| {
        println!("Before: {}", cx.stuff);
        cx.stuff += 1;
        println!("After: {}", cx.stuff);
    });
}