Cargo.toml manifest parsing error for missing README since nightly 2020-06-09

[timvisee]

I'm seeing Cargo.toml manifest parsing errors using the latest Rust nightly. This started showing up in CI today. It seems this is caused by a missing README file when configured in Cargo.toml of the respective crates.

Here are some of the errors:

  Downloaded rustls v0.17.0
error: failed to parse manifest at `/usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/rustls-0.17.0/Cargo.toml`
Caused by:
  readme file with name '../README.md' was not found

  Downloaded bitvec v0.16.2
error: failed to parse manifest at `/usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/bitvec-0.16.2/Cargo.toml`
Caused by:
  readme file with name 'README.md' was not found

  Downloaded remove_dir_all v0.5.2
error: failed to parse manifest at `/usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/remove_dir_all-0.5.2/Cargo.toml`
Caused by:
  readme file with name 'README.md' was not found

Maybe this should just show a warning instead, to prevent breaking existing crates? Quite a few crates on crates.io seem to suffer from this problem.

Meta

rustc --version --verbose:

rustc 1.46.0-nightly (a37c32e2d 2020-06-11)
cargo 1.46.0-nightly (1ec223eff 2020-06-09)

Here are the CI logs I'm seeing these errors in:

• https://gitlab.com/timvisee/ffsend-api/-/jobs/592712334
• https://gitlab.com/timvisee/pokoebox/-/jobs/592713822#L1662
• https://gitlab.com/timvisee/ffsend/-/jobs/592712179
• https://gitlab.com/timvisee/copypasta-ext/-/jobs/592714533
• https://gitlab.com/timvisee/wikitrans/-/jobs/592798987

[jonas-schievink]

Duplicate of rust-lang/cargo#8351

[sfackler]

This should probably be filed on the https://github.com/rust-lang/cargo repository.

[timvisee]

You're right. Should have posted this in the cargo repository. I'll follow the progress on this there.

Thanks for the quick response.