tracerr

API Docs | Changelog

Custom compile-time captured error tracing for Rust.

Usage

The common rule:

• Use macro to capture trace frame in the invocation place.

use tracerr::Traced;

let err = tracerr::new!("my error"); // captures frame

let res: Result<(), _> = Err(err)
    .map_err(tracerr::wrap!()); // captures frame

let err: Traced<&'static str> = res.unwrap_err();
assert_eq!(
    format!("{err}\n{}", err.trace()),
    r"my error
error trace:
rust_out
  at src/lib.rs:6
rust_out
  at src/lib.rs:9",
);

let (val, trace) = err.split();
assert_eq!(
    format!("{val}\n{trace}"),
    r"my error
error trace:
rust_out
  at src/lib.rs:6
rust_out
  at src/lib.rs:9",
);

License

Copyright © 2019-2026 Instrumentisto Team, https://github.com/instrumentisto Copyright © 2026 Kai Ren, https://github.com/tyranron

This software is subject to the terms of the Blue Oak Model License 1.0.0. If a copy of the BlueOak-1.0.0 license was not distributed with this file, You can obtain one at https://blueoakcouncil.org/license/1.0.0.