warning: unexpected `cfg` condition name: `has_error_description_deprecated`

[thereal-grayner]

Hello,

Today installed electrs on another machine on my LAN, followed the same install process as before but this time encountered this error.

I did an earlier install on Ubuntu 22.04.5 LTS a week or so ago, todays install was on a different PC running Lubuntu 24.04.4 LTS and got the warning below.

This didn't happen on my other machine when I installed as far as I can see the same thing a week or so back, so IDK why it happened this time.

Anyway, the error message has some advice for dev's as to how to prevent it, so thought I should pass that on.

Details below.

Thanks,
Glen.

Did the standard install of clang/cmake/rustup and all good.
...
info: profile set to default
info: default host triple is x86_64-unknown-linux-gnu
info: syncing channel updates for stable-x86_64-unknown-linux-gnu
info: latest update on 2026-03-26 for version 1.94.1 (e408947bf 2026-03-25)
$ . "$HOME/.cargo/env"

So then tried to compile/run electrs:
$ git clone https://github.com/blockstream/electrs && cd electrs
$ git checkout new-index
Already on 'new-index'
Your branch is up-to-date with 'origin/new-index'.

$ cargo run --release --bin electrs -- -vvv --lightmode --timestamp ... etc etc
info: syncing channel updates for 1.92.0-x86_64-unknown-linux-gnu
info: latest update on 2025-12-11 for version 1.92.0 (ded5c06cf 2025-12-08)
info: downloading 7 components
...
Spent a while time building and compiling and then this happened:
...
Compiling rocksdb v0.24.0
Compiling electrs v0.4.1 (/home/grayner/electrs)
warning: unexpected cfg condition name: has_error_description_deprecated
--> src/errors.rs:1:1
|
1 | / error_chain! {
2 | | types {
3 | | Error, ErrorKind, ResultExt, Result;
... |
34 | | }
| |_^
|
= help: expected names are: docsrs, feature, and test and 31 more
= note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
= help: try referring to impl_error_chain_processed crate for guidance on how handle this unexpected cfg
= help: the macro impl_error_chain_processed may come from an old version of the error_chain crate, try updating your dependency with cargo update -p error_chain
= note: see https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html for more information about checking conditional configuration
= note: #[warn(unexpected_cfgs)] on by default
= note: this warning originates in the macro impl_error_chain_processed which comes from the expansion of the macro error_chain (in Nightly builds, run with -Z macro-backtrace for more info)

warning: electrs (lib) generated 1 warning
Finished release profile [optimized] target(s) in 49m 38s