error[E0658]: arbitrary expressions in key-value attributes are unstable

[happysalada]

Please complete the following tasks

• I have searched the discussions
• I have searched the existing issues

Rust Version

1.54

Clap Version

3.0.0-beta-4

Minimal reproducible code

There is a compilation error on darwin and linux
the pueue crate which has a dependency on clap, will fail compiling from source with the following error

pueue> error[E0658]: arbitrary expressions in key-value attributes are unstable
pueue> --> /private/tmp/nix-build-pueue-1.0.1.drv-0/pueue-1.0.1-vendor.tar.gz/clap/src/lib.rs:8:10
pueue> |
pueue> 8 | #![doc = include_str!("../README.md")]
pueue> | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pueue> |
pueue> = note: see issue #78835 rust-lang/rust#78835 for more information
pueue> error: aborting due to previous error
pueue> For more information about this error, try rustc --explain E0658.
pueue> error: could not compile clap
pueue> To learn more, run the command again with --verbose.
pueue> warning: build failed, waiting for other jobs to finish...
pueue> error: build failed

Steps to reproduce the bug with the above code

Here is the link to the crate https://github.com/Nukesor/pueue
running cargo build from the src will trigger the error

Actual Behaviour

compilation error

Expected Behaviour

no compilation error

Additional Context

This is for packaging for the NixOS distribution.

Debug Output

No response

[epage]

Thats strange. In beta4, we bumped MSRV to 1.54 which stablized this feature but your report mentions using 1.54.

[happysalada]

My bad, I was actually on version 1.53, sorry for the bother!