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pub use std::sync::Arc as Share;
pub use thiserror::Error;

pub trait Mut : core::ops::Deref {
    /// Acquire the mutable borrow of a pointer.
    /// May clone the content if necessary.
    fn mutate(&mut self) -> &mut Self::Target;
}

impl<T: Clone> Mut for std::rc::Rc<T> {
    fn mutate(&mut self) -> &mut Self::Target {
        std::rc::Rc::make_mut(self)
    }
}

impl<T: Clone> Mut for Share<T> {
    fn mutate(&mut self) -> &mut Self::Target {
        Share::make_mut(self)
    }
}