[vladvasiliu]

It looks to me like 0.4.5 still requires nightly:

  error: failed to run custom build command for `rocket_codegen v0.4.5`
  
  Caused by:
    process didn't exit successfully: `/home/vlad/code/test-rocket/target/debug/build/rocket_codegen-f5b5d853ac3ddd89/build-script-build` (exit code: 101)
    --- stderr
    Error: Rocket (codegen) requires a 'dev' or 'nightly' version of rustc.
    Installed version: 1.47.0 (2020-10-07)
    Minimum required:  1.33.0-nightly (2019-01-13)

Edit: formatting

[fluffything]

Indeed. Apparently the support for stable Rust was merged onto master months ago, but there hasn't been a release since then. 0.5 should be the first version that builds on stable Rust according to this thread: https://github.com/SergioBenitez/Rocket/issues/19