3cb9fa26ef
This commit is an implementation of [RFC 565][rfc] which is a stabilization of the `std::fmt` module and the implementations of various formatting traits. Specifically, the following changes were performed: [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0565-show-string-guidelines.md * The `Show` trait is now deprecated, it was renamed to `Debug` * The `String` trait is now deprecated, it was renamed to `Display` * Many `Debug` and `Display` implementations were audited in accordance with the RFC and audited implementations now have the `#[stable]` attribute * Integers and floats no longer print a suffix * Smart pointers no longer print details that they are a smart pointer * Paths with `Debug` are now quoted and escape characters * The `unwrap` methods on `Result` now require `Display` instead of `Debug` * The `Error` trait no longer has a `detail` method and now requires that `Display` must be implemented. With the loss of `String`, this has moved into libcore. * `impl<E: Error> FromError<E> for Box<Error>` now exists * `derive(Show)` has been renamed to `derive(Debug)`. This is not currently warned about due to warnings being emitted on stage1+ While backwards compatibility is attempted to be maintained with a blanket implementation of `Display` for the old `String` trait (and the same for `Show`/`Debug`) this is still a breaking change due to primitives no longer implementing `String` as well as modifications such as `unwrap` and the `Error` trait. Most code is fairly straightforward to update with a rename or tweaks of method calls. [breaking-change] Closes #21436
46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
#![feature(unsafe_destructor)]
|
|
|
|
trait X {
|
|
fn call<T: std::fmt::Debug>(&self, x: &T);
|
|
fn default_method<T: std::fmt::Debug>(&self, x: &T) {
|
|
println!("X::default_method {:?}", x);
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct Y(int);
|
|
|
|
#[derive(Debug)]
|
|
struct Z<T> {
|
|
x: T
|
|
}
|
|
|
|
impl X for Y {
|
|
fn call<T: std::fmt::Debug>(&self, x: &T) {
|
|
println!("X::call {:?} {:?}", self, x);
|
|
}
|
|
}
|
|
|
|
#[unsafe_destructor]
|
|
impl<T: X + std::fmt::Debug> Drop for Z<T> {
|
|
fn drop(&mut self) {
|
|
// These statements used to cause an ICE.
|
|
self.x.call(self);
|
|
self.x.default_method(self);
|
|
}
|
|
}
|
|
|
|
pub fn main() {
|
|
let _z = Z {x: Y(42)};
|
|
}
|