message: [ci] pin rustc to beta-2019-10-03 to avoid using 1.40 beta
  Closes:
  Approved by: dmitri-perelman
diff: @@ -15,6 +15,14 @@ executors:
  resource_class: small
  commands:
  + rust_setup:
  + description: Set rustc version
  + steps:
  + - run:
  + name: Set rustc version
  + command: |
  + rustup toolchain install beta-2019-10-03
  + rustup override set beta-2019-10-03
  print_versions:
  description: Version Info
  steps:
  @@ -45,6 +53,7 @@ commands:
  build_setup:
  steps:
  - checkout
  + - rust_setup
  - print_versions
  - env_setup
  - install_deps
  