error[E0658]: use of unstable library feature 'proc_macro_is_available'

[Thearas]

cargo install when-cli error:

error[E0658]: use of unstable library feature 'proc_macro_is_available'
  --> /Users/thearas/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.33/src/detection.rs:28:21
   |
28 |     let available = proc_macro::is_available();
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #71436 <https://github.com/rust-lang/rust/issues/71436> for more information
   = help: add `#![feature(proc_macro_is_available)]` to the crate attributes to enable

For more information about this error, try `rustc --explain E0658`.
error: could not compile `proc-macro2` due to previous error
warning: build failed, waiting for other jobs to finish...
error: failed to compile `when-cli v0.1.0`, intermediate artifacts can be found at `/var/folders/wb/ss6s2j2n1nj5jl5_v_qy2br40000gn/T/cargo-installFv9jfm`

Caused by:
  build failed

Version

rustc 1.57.0-nightly (b69fe5726 2021-09-10)

[mitsuhiko]

I cannot explain this. I am assuming something is wrong with your rust installation. The error is also not originating in when-cli but proc-macro2. I found this related issue: dtolnay/proc-macro2#307

Generally nightly is not a compiler you should be using for installing such packages as nightly will regularly regress. Please use a stable rust compiler instead.