On 29-06-2022 16:46, peter@polidoro.io wrote:
>       (build-system cargo-build-system)
>       (arguments
> -     `(#:cargo-development-inputs
> +     `(#:cargo-inputs (("rust-backtrace" ,rust-backtrace-0.3))
> +       #:cargo-development-inputs
>          (("rust-futures" ,rust-futures-0.3)
>           ("rust-rustversion" ,rust-rustversion-1)
> +        ("rust-syn" ,rust-syn-1)
>           ("rust-thiserror" ,rust-thiserror-1)
>           ("rust-trybuild" ,rust-trybuild-1))))

I assume you updated rust-rustversion to update rust-anyhow?  If so, I 
have looked at the Cargo.toml of anyhow. It is very picky in the version 
of dependents, so if in the future we update rust-rustversion again, 
rust-anyhow will fail to build. To be robust to that, the Cargo.toml 
needs to be patched to be less picky, or alternatively you could wait 
for antioxidant which ignores the version specifications entirely.

Greetings,
Maxime.