rustc: Tweak expansion of #[proc_macro] for 2018
The syntactical expansion of `#[proc_macro]` and related attributes currently contains absolute paths which conflicts with a lint for the 2018 edition, causing issues like #52214. This commit puts a band-aid on the issue by ensuring that procedural macros can also migrate to the 2018 edition for now by tweaking the expansion based on what features are activated. A more long-term solution would probably tweak the edition hygiene of spans, but this should do the trick for now. Closes #52214
Showing
想要评论请 注册 或 登录