Replace err_derive with thiserror

`err_derive` is unmaintained and will probably stop working with rust
edition 2024. `thiserror` is almost a drop-in replacement. This commit
simply replaces all occurences of `derive(err_derive::Error)` with
`derive(thiserror::Error)` and fixes the attributes, but the Error and
Display impls should be identical.

2 files changed, 3 insertions, 3 deletions

diff --git a/test/test-runner/Cargo.toml b/test/test-runner/Cargo.toml
index 1a0163213f..dbe57c938e 100644
--- a/test/test-runner/Cargo.toml
+++ b/test/test-runner/Cargo.toml
@@ -15,7 +15,7 @@ futures = { workspace = true }
 tarpc = { workspace = true }
 tokio = { workspace = true }
 tokio-serial = { workspace = true }
-err-derive = { workspace = true }
+thiserror = { workspace = true }
 log = { workspace = true }
 once_cell = { workspace = true }
 parity-tokio-ipc = "0.9"
diff --git a/test/test-runner/src/main.rs b/test/test-runner/src/main.rs
index 74f7761cc2..befeeb61e0 100644
--- a/test/test-runner/src/main.rs
+++ b/test/test-runner/src/main.rs
@@ -325,9 +325,9 @@ fn get_pipe_status() -> ServiceStatus {
 /// Keep this constant in sync with `test-manager/src/run_tests.rs`
 const BAUD: u32 = if cfg!(target_os = "macos") { 0 } else { 115200 };
 
-#[derive(err_derive::Error, Debug)]
+#[derive(thiserror::Error, Debug)]
 pub enum Error {
-    #[error(display = "Unknown RPC")]
+    #[error("Unknown RPC")]
     UnknownRpc,
 }