This repository contains a reproduction of what seems to be a bug in valuable-serde.
There's two versions of a struct, wrapping Valuable around anyhow::Error.
Working version
This version stringifies the values and holds them in a struct which derives Valuable.
The struct ValuableAnyhow is properly serialized and can be printed.
Additionally in this directory, there is an expanded.rs which contains results of cargo expand.
$ cd working
$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
Running `/home/jaskij/projects/rust/valuable_serde_repro/target/debug/working`
JSON: {"message":"asdf FOO","root_cause":"\"asdf FOO\"","chain":[]}Not working
This version anyhow::Error and manually implements Valuable.
Here, the struct fails to serialize properly and we get a very unhelpful error from serde_json.
$ cd not_working
$ cargo run --bin not_working
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
Running `/home/jaskij/projects/rust/valuable_serde_repro/target/debug/not_working`
FAILED: Error("asdf FOO", line: 0, column: 0)Tracing
Additionally, tracing-subscriber seems to silently swallow events which fail to serialize.
$ cd not_working
$ cargo run --bin tracing
Finished dev [unoptimized + debuginfo] target(s) in 0.01s
Running `/home/jaskij/projects/rust/valuable_serde_repro/target/debug/tracing`