Method try_borrow_mut

aiscript-arena/src/lock.rs:284–286

(self, mc: &Mutation<'gc>)

    #[inline]
    pub fn try_borrow_mut(self, mc: &Mutation<'gc>) -> Result<RefMut<'gc, T>, BorrowMutError> {
        self.unlock(mc).try_borrow_mut()
    }
}

// We can't have `T: ?Sized` here because rustc is dumb and doesn't