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1dc4858914
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 😅
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| .. | ||
| analyze_source_file | ||
| lev_distance | ||
| source_map | ||
| symbol | ||
| analyze_source_file.rs | ||
| caching_source_map_view.rs | ||
| def_id.rs | ||
| edition.rs | ||
| fatal_error.rs | ||
| hygiene.rs | ||
| lev_distance.rs | ||
| lib.rs | ||
| profiling.rs | ||
| source_map.rs | ||
| span_encoding.rs | ||
| symbol.rs | ||
| tests.rs | ||