custom inner attributes crater analysis

Report: https://crater-reports.s3.amazonaws.com/pr-134276/index.html

Looking at crates.io failures:

• ac-library-rs-expander-0.1.0
  • last updated 4 years ago
  • github repo link broken
  • broken by semver-parser-0.10.1;
    0.10.2 fixes the build and got released almost 4 years ago
• ampr-api-0.1.0
  • spurious
• an-ws-0.1.0
  • spurious
• ansi-diff-1.1.0
  • spurious
• apollo-ariadne-0.2.0-alpha.0
  • spurious
• apple_codesign_adhoc-0.1.0
  • spurious
• argan-extra-0.0.0
  • spurious
• argfetch-0.1.6
  • spurious
• async-read-length-limit-0.1.3
  • spurious
• async-wasm-0.2.0
  • spurious
• audio-clock-0.2.0
  • spurious
• bevy_library-0.0.1
  • spurious
• bigfoot-0.1.0
  • spurious
• discretionary_engine_macros-0.1.1
  • spurious
• filebox-0.1.0-beta.0
  • spurious
• flat-tree-6.0.0
  • spurious
• http-range-client-0.8.0
  • spurious
• ironrdp-async-0.2.0 (outdated)
  • spurious
• nth-cons-list-0.1.0
  • spurious
• pulsar-client-0.0.1
  • crate last updated 4 years ago, ~1k downloads
  • broken by pulsar-binary-protocol-spec-0.0.1, a crate that only ever had 1 version which was published 4 years ago
    • the attribute is in a file generated by rust-protobuf 2.22.0; apparently old versions of that tool added a #![rustfmt::skip]