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 Error<T>
where
    T: std::fmt::Debug,
{
    #[error("io")]
    Io(#[from] io::Error),

    #[error("marker")]
    #[allow(dead_code)]
    Marker(T),
}

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

fn outer() -> Result<(), Error<u8>> {
    inner()?;
    Ok(())
}

#[test]
fn generic_enum_from_captures_frame() {
    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("generics.rs"));
}