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
60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-flags:--cfg set1 --cfg set2
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#![allow(dead_code)]
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use std::fmt::Debug;
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struct NotDebugable;
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#[cfg_attr(set1, derive(Debug))]
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struct Set1;
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#[cfg_attr(notset, derive(Debug))]
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struct Notset(NotDebugable);
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#[cfg_attr(not(notset), derive(Debug))]
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struct NotNotset;
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#[cfg_attr(not(set1), derive(Debug))]
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struct NotSet1(NotDebugable);
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#[cfg_attr(all(set1, set2), derive(Debug))]
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struct AllSet1Set2;
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#[cfg_attr(all(set1, notset), derive(Debug))]
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struct AllSet1Notset(NotDebugable);
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#[cfg_attr(any(set1, notset), derive(Debug))]
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struct AnySet1Notset;
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#[cfg_attr(any(notset, notset2), derive(Debug))]
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struct AnyNotsetNotset2(NotDebugable);
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#[cfg_attr(all(not(notset), any(set1, notset)), derive(Debug))]
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struct Complex;
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#[cfg_attr(any(notset, not(any(set1, notset))), derive(Debug))]
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struct ComplexNot(NotDebugable);
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#[cfg_attr(any(target_endian = "little", target_endian = "big"), derive(Debug))]
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struct KeyValue;
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fn is_show<T: Debug>() {}
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fn main() {
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is_show::<Set1>();
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is_show::<NotNotset>();
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is_show::<AllSet1Set2>();
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is_show::<AnySet1Notset>();
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is_show::<Complex>();
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is_show::<KeyValue>();
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}
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