error[E0658]: the unsafe_op_in_unsafe_fn lint is unstable

[Kreyren]

kreyren@leonid ~/Repositories/guix [env]$ ./pre-inst-env guix build rust-cargo-make
...
   Compiling ansi_term v0.11.0
   Compiling git_info v0.1.2
   Compiling rust_info v0.3.2
error[E0658]: the `unsafe_op_in_unsafe_fn` lint is unstable
   --> /tmp/guix-build-rust-cargo-make-0.35.6.drv-0/cargo-make-0.35.6/guix-vendor/rust-rust-info-0.3.2.tar.gz/src/lib.rs:1:1
    |
1   | / #![deny(
2   | |     absolute_paths_not_starting_with_crate,
3   | |     ambiguous_associated_items,
4   | |     anonymous_parameters,
...   |
125 | |     useless_deprecated
126 | | )]
    | |__^
    |
    = note: see issue #71668 <https://github.com/rust-lang/rust/issues/71668> for more information

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.
error: could not compile `rust_info`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
command "cargo" "build" "--release" failed with status 101
builder for `/gnu/store/9gi25bn6f4zn6c9qrz6mbhgw3k82yxcj-rust-cargo-make-0.35.6.drv' failed with exit code 1
build of /gnu/store/9gi25bn6f4zn6c9qrz6mbhgw3k82yxcj-rust-cargo-make-0.35.6.drv failed
View build log at '/var/log/guix/drvs/9g/i25bn6f4zn6c9qrz6mbhgw3k82yxcj-rust-cargo-make-0.35.6.drv.bz2'.
guix build: error: build of `/gnu/store/9gi25bn6f4zn6c9qrz6mbhgw3k82yxcj-rust-cargo-make-0.35.6.drv' failed

Describe The Bug

Fails to build on while defining cargo-make as a package for GNU Giox

To Reproduce

On GNU Guix:

1. Invoke guix import crate cargo-make -r >> path/to/guix/repo/gnu/packages/crates-io.scm
2. Use fix described in Wrong license identification on crates.io breaks guix importer briansmith/webpki#246
3. Experience the build failure

Theoretical

1. Build it on stable rustlang toolchain?

Relevants

R.1. rust-lang/rust#71668

[sagiegurari]

i think you need to update your rust version

[Kreyren]

yep, sorry didn't realize that guix is using 1.48 x.x