Compile problem with rust 1.17.0

[beingalink]

This is a folluw up to this issue.

I was trying to cargo install cargo-update but it errors out when compiling serde_derive:

   Compiling serde_derive v0.9.15
error: proc-macro derive panicked
  --> .cargo/registry/src/github.com-1ecc6299db9ec823/cargo-update-0.8.1/src/ops/config.rs:43:73
   |
43 | #[derive(Debug, Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
   |                                                                         ^^^^^^^^^^^
   |
   = help: message: proc_macro::__internal::with_parse_sess() called before set_parse_sess()!

error: failed to compile `cargo-update v0.8.1`, intermediate artifacts can be found at `/var/folders/5m/qk85bf793gzdmrgxpd2qrl4m0000gn/T/cargo-install.f94WA1eo7V4Z`

I'm on macOS 10.12.4 and Rust 1.17.0 installed with homebrew.

[dtolnay]

This is #39870. The homebrew packaging for Rust is screwed up. Uninstall it with homebrew and reinstall it with https://rustup.rs/ to fix this.

[beingalink]

Installing with rustup fixed it. Thank you!

[ilovezfs]

This should no longer be a problem in Homebrew due to Homebrew/homebrew-core#14490.