2022-06-30 / 10:10 / maximedevos@telenet.be:
Toggle quote (9 lines)
> Mekeor Melire schreef op wo 29-06-2022 om 22:57 [+0000]:
> > the rust-compiler which is packaged for guix supports edition2021
> > but the cargo version packaged for guix does not
>
> Pretty sure that it does, IIRC under antioxidant-build-system I've seen
> some things being compiled with the 2021 edition of rust, presumably
> they also compiled under cargo-build-system.
i tested this again. i'll describe the issue with some instructions:
create a cargo project:
$ cargo new foo
$ cd foo
use edition 2021 instead of 2018:
$ sed -i 's/2018/2021/' Cargo.toml
attempt to build and run. you'll observe an error:
$ cargo run
> error: failed to parse manifest at `/home/user/foo/Cargo.toml`
> Caused by:
> feature `edition2021` is required
> consider adding `cargo-features = ["edition2021"]` to the manifest
specify the 2021-edition as a cargo-feature, as suggested by cargo.
and try building and running again. it'll work fine:
$ (echo 'cargo-features = ["edition2021"]' && cat Cargo.toml) | \
sponge Cargo.toml
$ cargo run
> [...]
> Hello world!
but now, let's add a package as dependency - a package which uses
edition2021. and then, try to build and run:
$ echo 'axum = "0.5.4"' >> Cargo.toml
$ cargo run
> error: failed to download `axum-core v0.2.6`
> Caused by:
> unable to get packages from source
> Caused by:
> failed to parse manifest at
> `/home/user/.cargo/registry/src/github.com-1ecc6299db9ec823/axum-core-0.2.6/Cargo.toml`
> Caused by:
> feature `edition2021` is required
> consider adding `cargo-features = ["edition2021"]` to the manifest
TLDR: you can't build projects which depend on packages which depend on
edition2021.
