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Rollup merge of #94433 - Urgau:check-cfg-allowness, r=petrochenkov 
Improve allowness of the unexpected_cfgs lint

This pull-request improve the allowness (`#[allow(...)]`) of the `unexpected_cfgs` lint.

Before this PR only crate level `#![allow(unexpected_cfgs)]` worked, now with this PR it also work when put around `cfg!` or if it is in a upper level. Making it work ~for the attributes `cfg`, `cfg_attr`, ...~ for the same level is awkward as the current code is design to give "Some parent node that is close to this macro call" (cf. https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/base/struct.ExpansionData.html) meaning that allow on the same line as an attribute won't work. I'm note even sure if this would be possible.

Found while working on https://github.com/rust-lang/rust/pull/94298.
r? ````````@petrochenkov````````
2022-03-03 01:09:12 +01:00
..
src Rollup merge of #94433 - Urgau:check-cfg-allowness, r=petrochenkov 2022-03-03 01:09:12 +01:00
Cargo.toml Update thorin-dwp to deduplicate object 2022-01-20 15:09:05 +01:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.