[Mocktopus' documentation](https://docs.rs/crate/mocktopus) on doc.rs is failing with: ``` docs.rs failed to build mocktopus-0.5.0 Please check build logs and if you believe this is docs.rs' fault, report into this issue report. ``` [Doc.rs build logs](https://docs.rs/crate/mocktopus/0.5.0/builds/109022) Looking at the build logs, it is as if the documentation was built with stable rustc.