Dylan DPC 1dc4858914 Rollup merge of #96478 - WaffleLapkin:rustc_default_body_unstable, r=Aaron1011 ... Implement `#[rustc_default_body_unstable]` This PR implements a new stability attribute — `#[rustc_default_body_unstable]`. `#[rustc_default_body_unstable]` controls the stability of default bodies in traits. For example: ```rust pub trait Trait { #[rustc_default_body_unstable(feature = "feat", isssue = "none")] fn item() {} } ``` In order to implement `Trait` user needs to either - implement `item` (even though it has a default implementation) - enable `#![feature(feat)]` This is useful in conjunction with [`#[rustc_must_implement_one_of]`](https://github.com/rust-lang/rust/pull/92164), we may want to relax requirements for a trait, for example allowing implementing either of `PartialEq::{eq, ne}`, but do so in a safe way — making implementation of only `PartialEq::ne` unstable. r? `@Aaron1011` cc `@nrc` (iirc you were interested in this wrt `read_buf`), `@danielhenrymantilla` (you were interested in the related `#[rustc_must_implement_one_of]`) P.S. This is my first time working with stability attributes, so I'm not sure if I did everything right 😅		2022-08-09 17:34:50 +05:30
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src	Rollup merge of #96478 - WaffleLapkin:rustc_default_body_unstable, r=Aaron1011	2022-08-09 17:34:50 +05:30
Cargo.toml	move encode_and_write_metadata to rustc_metadata::fs	2022-07-02 22:51:40 +09:00