thistrace 0.1.0

Callsite provenance (file/line/col) for thiserror #[from] conversions via #[track_caller]
Documentation 
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use std::io;

use thistrace::{traceable, HasTrace};

#[traceable]
#[derive(thiserror::Error, Debug)]
enum AppError {
    #[error("io")]
    Io(#[from] io::Error, std::path::PathBuf),
}

fn inner() -> Result<(), io::Error> {
    Err(io::Error::new(io::ErrorKind::Other, "boom"))
}

fn outer() -> Result<(), AppError> {
    inner()?;
    Ok(())
}

#[test]
fn tuple_variant_with_context_compiles_and_captures_trace() {
    let err = outer().unwrap_err();
    let trace = err.trace().expect("trace should exist");
    assert_eq!(trace.frames().len(), 1);
    assert!(trace.frames()[0]
        .file
        .ends_with("tuple_variant_with_context.rs"));
}