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Rust 2019 --- Finish core stuff

I am a relatively new in Rust, but I believe I have gathered enough experience the last few months to enjoy its strengths and discover some of its current shortcomings. Being relatively new at Rust, I am also of this generation that started immediately with Edition 2018. I switched to nightly very early on, and recently have been porting some code back to stable (1.31.x). I am overall very satisfied with Rust, but sometimes I come across something that doesn't work as I hoped. Every time that happens, I discover there is work-in-progress solving these issues, including, most of the time, a merged RFC, a nightly implementation behind feature gates or at least some blogs from core developers. Many time, the work I come across is from many years back.

I have read several #Rust2019 and I want to use this opportunity to agree with those that suggest to finish current core stuff.

Rust core developers can only do so much. Yes, it would be nice to spend more energy kicks

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fn main() {
    let s = "Foo";
    let s = foo(s);
    println!("{}", s);
}

fn foo(s: &str) -> &str {
    let s2 = "Bar";
    println!("{}", s2);
    s

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use std::ops;

#[derive(Debug)]
struct Point(i32, i32);

impl ops::Add<Point> for Point {
    type Output = Point;
    fn add(self, _rhs: Point) -> Point {
        Point(self.0 + _rhs.0, self.1 + _rhs.1)
    }

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fn main() {
    let s = "Foo".to_string();
    let s = foo(s);
    println!("{}", s);
}

fn foo(_s: String) -> String {
    let s2 = "Bar".to_string();
    println!("{}", s2);
    s2

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fn main() {
    let s = "Foo".to_string();
    let s = foo(s);
    println!("{}", s);
}

fn foo(s: String) -> String {
    let s2 = "Bar".to_string();
    println!("{}", s2);
    s

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fn main() {
    let s = "Foo".to_string();
    let newS = foo(s);
    println!("{}", s);
}

fn foo(s: String) -> String {
    let s2 = "Bar".to_string();
    println!("{}", s2);
    s

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