Failed install - compiling clap v2.33.4 error[E0658]

[pflugercar]

I have a fresh install of Debian 10 on a Linode server. I ran the install with:
sudo cargo install wireguard-vanity-address

It compiles several packages until package 57/69, clap v2.33.4.

Compiling clap v2.33.4
error[E0658]: if is not allowed in a const fn
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.33.4/src/app/settings.rs:7:1
|
7 | / bitflags! {
8 | | struct Flags: u64 {
9 | | const SC_NEGATE_REQS = 1;
10 | | const SC_REQUIRED = 1 << 1;
... |
51 | | }
52 | | }
| |_^
|
= note: for more information, see rust-lang/rust#49146
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0658]: if is not allowed in a const fn
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.33.4/src/args/settings.rs:6:1
|
6 | / bitflags! {
7 | | struct Flags: u32 {
8 | | const REQUIRED = 1;
9 | | const MULTIPLE = 1 << 1;
... |
28 | | }
29 | | }
| |_^
|
= note: for more information, see rust-lang/rust#49146
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0658.
error: failed to compile wireguard-vanity-address v0.4.0, intermediate artifacts can be found at /tmp/cargo-installFBAhlU

Caused by:
could not compile clap.

---

Below is the tail end of output with cargo --verbose install wireguard-vanity-address

Compiling clap v2.33.4
Running rustc --crate-name clap /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.33.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 --cfg 'feature="ansi_term"' --cfg 'feature="atty"' --cfg 'feature="color"' --cfg 'feature="default"' --cfg 'feature="strsim"' --cfg 'feature="suggestions"' --cfg 'feature="vec_map"' -C metadata=9b822f22bb354117 -C extra-filename=-9b822f22bb354117 --out-dir /tmp/cargo-installlsgmPX/release/deps -L dependency=/tmp/cargo-installlsgmPX/release/deps --extern ansi_term=/tmp/cargo-installlsgmPX/release/deps/libansi_term-eadfc56f31755089.rmeta --extern atty=/tmp/cargo-installlsgmPX/release/deps/libatty-c0963bed9091c183.rmeta --extern bitflags=/tmp/cargo-installlsgmPX/release/deps/libbitflags-8094798d4dc009ac.rmeta --extern strsim=/tmp/cargo-installlsgmPX/release/deps/libstrsim-96e860a76a9cf922.rmeta --extern textwrap=/tmp/cargo-installlsgmPX/release/deps/libtextwrap-bcf2a3b2c5524d26.rmeta --extern unicode_width=/tmp/cargo-installlsgmPX/release/deps/libunicode_width-555477aac4588305.rmeta --extern vec_map=/tmp/cargo-installlsgmPX/release/deps/libvec_map-a03ca84b9540c7a2.rmeta --cap-lints allow
error[E0658]: if is not allowed in a const fn
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.33.4/src/app/settings.rs:7:1
|
7 | / bitflags! {
8 | | struct Flags: u64 {
9 | | const SC_NEGATE_REQS = 1;
10 | | const SC_REQUIRED = 1 << 1;
... |
51 | | }
52 | | }
| |_^
|
= note: for more information, see rust-lang/rust#49146
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0658]: if is not allowed in a const fn
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.33.4/src/args/settings.rs:6:1
|
6 | / bitflags! {
7 | | struct Flags: u32 {
8 | | const REQUIRED = 1;
9 | | const MULTIPLE = 1 << 1;
... |
28 | | }
29 | | }
| |_^
|
= note: for more information, see rust-lang/rust#49146
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0658.
error: failed to compile wireguard-vanity-address v0.4.0, intermediate artifacts can be found at /tmp/cargo-installlsgmPX

Caused by:
could not compile clap.

Caused by:
process didn't exit successfully: rustc --crate-name clap /root/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.33.4/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 --cfg 'feature="ansi_term"' --cfg 'feature="atty"' --cfg 'feature="color"' --cfg 'feature="default"' --cfg 'feature="strsim"' --cfg 'feature="suggestions"' --cfg 'feature="vec_map"' -C metadata=9b822f22bb354117 -C extra-filename=-9b822f22bb354117 --out-dir /tmp/cargo-installlsgmPX/release/deps -L dependency=/tmp/cargo-installlsgmPX/release/deps --extern ansi_term=/tmp/cargo-installlsgmPX/release/deps/libansi_term-eadfc56f31755089.rmeta --extern atty=/tmp/cargo-installlsgmPX/release/deps/libatty-c0963bed9091c183.rmeta --extern bitflags=/tmp/cargo-installlsgmPX/release/deps/libbitflags-8094798d4dc009ac.rmeta --extern strsim=/tmp/cargo-installlsgmPX/release/deps/libstrsim-96e860a76a9cf922.rmeta --extern textwrap=/tmp/cargo-installlsgmPX/release/deps/libtextwrap-bcf2a3b2c5524d26.rmeta --extern unicode_width=/tmp/cargo-installlsgmPX/release/deps/libunicode_width-555477aac4588305.rmeta --extern vec_map=/tmp/cargo-installlsgmPX/release/deps/libvec_map-a03ca84b9540c7a2.rmeta --cap-lints allow (exit code: 1)

[megapro17]

It does install perfectly on ubuntu 22.04 wsl. That's a lesson for you to never use crappy debian with ancient packages