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

[valmormn]

Tried to install it with both stable and nightly version of rust and got the same error

For more information about this error, try `rustc --explain E0658`.
error: failed to compile `lolcrab v0.1.0`, intermediate artifacts can be found at `/tmp/cargo-installGIyozr`

Caused by:
  could not compile `clap`

[mazznoer]

Please run rustup update and try installing again.

[valmormn]

Unfortunately, it happened again even though I've run "rustup update"

`
❯ cargo install lolcrab
Updating crates.io index
Installing lolcrab v0.1.0
Compiling libc v0.2.101
Compiling getrandom v0.1.16
Compiling proc-macro2 v1.0.29
Compiling unicode-xid v0.2.2
Compiling cfg-if v1.0.0
Compiling syn v1.0.76
Compiling version_check v0.9.3
Compiling ppv-lite86 v0.2.10
Compiling siphasher v0.3.7
Compiling proc-macro-hack v0.5.19
Compiling autocfg v1.0.1
Compiling memchr v2.4.1
Compiling unicode-segmentation v1.8.0
Compiling lazy_static v1.4.0
Compiling hashbrown v0.11.2
Compiling unicode-width v0.1.8
Compiling vec_map v0.8.2
Compiling regex-automata v0.1.10
Compiling os_str_bytes v3.1.0
Compiling termcolor v1.1.2
Compiling strsim v0.10.0
Compiling bitflags v1.3.2
Compiling fastrand v1.5.0
Compiling phf_shared v0.8.0
Compiling proc-macro-error-attr v1.0.4
Compiling proc-macro-error v1.0.4
Compiling indexmap v1.7.0
Compiling textwrap v0.14.2
Compiling heck v0.3.3
Compiling atty v0.2.14
Compiling quote v1.0.9
Compiling rand_core v0.5.1
Compiling bstr v0.2.16
Compiling rand_pcg v0.2.1
Compiling rand_chacha v0.2.2
Compiling rand_xorshift v0.2.0
Compiling rand v0.7.3
Compiling noise v0.7.0
Compiling phf_generator v0.8.0
Compiling phf_macros v0.8.0
Compiling clap_derive v3.0.0-beta.4
Compiling phf v0.8.0
Compiling csscolorparser v0.5.0
Compiling colorgrad v0.5.0
Compiling clap v3.0.0-beta.4
error[E0658]: arbitrary expressions in key-value attributes are unstable
--> /home/v/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-3.0.0-beta.4/src/lib.rs:8:10
|
8 | #![doc = include_str!("../README.md")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #78835 rust-lang/rust#78835 for more information

error[E0658]: use of unstable library feature 'osstring_ascii'
--> /home/v/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-3.0.0-beta.4/src/parse/matches/matched_arg.rs:130:19
|
130 | v.eq_ignore_ascii_case(val)
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #70516 rust-lang/rust#70516 for more information

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0658.
error: failed to compile lolcrab v0.1.0, intermediate artifacts can be found at /tmp/cargo-installfcSU7G

Caused by:
could not compile clap

`

[valmormn]

Unfortunately, it happened again even though I've run "rustup update"

`
❯ cargo install lolcrab
Updating crates.io index
Installing lolcrab v0.1.0
Compiling libc v0.2.101
Compiling getrandom v0.1.16
Compiling proc-macro2 v1.0.29
Compiling unicode-xid v0.2.2
Compiling cfg-if v1.0.0
Compiling syn v1.0.76
Compiling version_check v0.9.3
Compiling ppv-lite86 v0.2.10
Compiling siphasher v0.3.7
Compiling proc-macro-hack v0.5.19
Compiling autocfg v1.0.1
Compiling memchr v2.4.1
Compiling unicode-segmentation v1.8.0
Compiling lazy_static v1.4.0
Compiling hashbrown v0.11.2
Compiling unicode-width v0.1.8
Compiling vec_map v0.8.2
Compiling regex-automata v0.1.10
Compiling os_str_bytes v3.1.0
Compiling termcolor v1.1.2
Compiling strsim v0.10.0
Compiling bitflags v1.3.2
Compiling fastrand v1.5.0
Compiling phf_shared v0.8.0
Compiling proc-macro-error-attr v1.0.4
Compiling proc-macro-error v1.0.4
Compiling indexmap v1.7.0
Compiling textwrap v0.14.2
Compiling heck v0.3.3
Compiling atty v0.2.14
Compiling quote v1.0.9
Compiling rand_core v0.5.1
Compiling bstr v0.2.16
Compiling rand_pcg v0.2.1
Compiling rand_chacha v0.2.2
Compiling rand_xorshift v0.2.0
Compiling rand v0.7.3
Compiling noise v0.7.0
Compiling phf_generator v0.8.0
Compiling phf_macros v0.8.0
Compiling clap_derive v3.0.0-beta.4
Compiling phf v0.8.0
Compiling csscolorparser v0.5.0
Compiling colorgrad v0.5.0
Compiling clap v3.0.0-beta.4
error[E0658]: arbitrary expressions in key-value attributes are unstable
--> /home/v/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-3.0.0-beta.4/src/lib.rs:8:10
|
8 | #![doc = include_str!("../README.md")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #78835 rust-lang/rust#78835 for more information

error[E0658]: use of unstable library feature 'osstring_ascii'
--> /home/v/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-3.0.0-beta.4/src/parse/matches/matched_arg.rs:130:19
|
130 | v.eq_ignore_ascii_case(val)
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #70516 rust-lang/rust#70516 for more information

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0658.
error: failed to compile lolcrab v0.1.0, intermediate artifacts can be found at /tmp/cargo-installfcSU7G

Caused by:
could not compile clap

`

The error happens when trying to compile "clap v3.0.0-beta.4".
I get no error when compiling "clap v2.33.3".

At https://github.com/clap-rs/clap/blob/master/CHANGELOG.md states that

v3.0.0-beta.4 (2021-08-14) Minimum Required Rust As of this release, clap requires rustc 1.54.0 or greater.

When I do rustup update I get:

`
❯ rustup update
info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'
info: checking for self-updates

stable-x86_64-unknown-linux-gnu unchanged - rustc 1.55.0 (c8dfcfe04 2021-09-06)
nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.57.0-nightly (9bb77da74 2021-09-13)
`

If I set rustup default nightly

`
❯ rustup default nightly
info: using existing install for 'nightly-x86_64-unknown-linux-gnu'
info: default toolchain set to 'nightly-x86_64-unknown-linux-gnu'

nightly-x86_64-unknown-linux-gnu unchanged - rustc 1.57.0-nightly (9bb77da74 2021-09-13)
`

But when I check rustc --version
❯ rustc --version rustc 1.51.0

[mazznoer]

Maybe you need to update the rustup itself first. Try rustup self update and then rustup update.

[mazznoer]

I run rustup update then cargo install lolcrab and it is compiled succesfully.