RustMissingDeps: version 0.22.4-r1: sets CARGO_OPTIONAL but does not depend on virtual/rust
  RustMissingDeps: version 0.22.5-r1: sets CARGO_OPTIONAL but does not depend on virtual/rust
  RustMissingDeps: version 0.22.6: sets CARGO_OPTIONAL but does not depend on virtual/rust