change the comment type in features!'s matcher

[zjp-CN]

This might not help to resolve #1469.

No idea for me :)

Edit: please ignore what I explained here before.

[sdroege]

It's weird stable Rust lets the original code pass.

This should also be reported to https://github.com/rust-lang/rust/ as a nightly regression.

[zjp-CN]

@sdroege Yeah, it's already there.

[zjp-CN]

See

• Failed to compile ring under nightly Rust (1.61.0, 9f4dc0b4d 2022-03-23) rust-lang/rust#95267 (comment)
• rust-lang/rust@10644e0

[faern]

Is the plan to have this merged and released no matter what rustc decides to do? It feels like the comment in question should not be a doc comment.

[paolobarbolini]

This should be merged anyway, even if the rustc regression were to be fixed. See rust-lang/rust#95390 (comment)

[briansmith]

Even though the rust-lang/rust change was made, which makes this non-critical, I've approved this change and I'll merge it as soon as CI/CD psases.

[codecov]

Codecov Report

Merging #1470 (ea2a7a5) into main (32b2c6c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1470   +/-   ##
=======================================
  Coverage   91.86%   91.86%           
=======================================
  Files         129      129           
  Lines       18363    18363           
  Branches      195      195           
=======================================
  Hits        16870    16870           
+ Misses       1461     1460    -1     
- Partials       32       33    +1     

Impacted Files	Coverage Δ
src/cpu/arm.rs	91.66% <ø> (ø)
crypto/cpu-intel.c	70.49% <0.00%> (-6.56%)	⬇️
crypto/curve25519/curve25519.c	99.77% <0.00%> (+0.07%)	⬆️
crypto/poly1305/poly1305.c	98.95% <0.00%> (+0.52%)	⬆️
src/aead/less_safe_key.rs	96.89% <0.00%> (+0.77%)	⬆️
src/io/der_writer.rs	100.00% <0.00%> (+2.17%)	⬆️

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