Without deeply looking into it, I'd expect that to integrate with SNAFU, you could basically write something like this:

    struct SpanTraceWrapper(tracing_error::SpanTrace);
    
    impl snafu::GenerateImplicitData for SpanTraceWrapper {
        fn generate() -> Self {
            Self(tracing_error::SpanTrace::capture())
        }
    }

And then you can use it as

    #[derive(Debug, Snafu)]
    struct SomeError {
        #[snafu(implicit)]
        span_trace: SpanTraceWrapper,
    }

This will capture the `SpanTrace` whenever `SomeError` is constructed (e.g. `thing().context(SomeSnafu)` or `SomeSnafu.fail()`.

Neat :)