This repository shows the test thing_numby failing when tracing-bunyan-formatter is added to the dependencies
If you go into the Cargo.toml and remove tracing-bunyan-formatter from the deps then the tests pass.
Test output from cargo test
$ cargo test
Finished test [unoptimized + debuginfo] target(s) in 0.02s
Running unittests (target/debug/deps/serde_parse_failure-6e794418de97ed7d)
running 5 tests
test tests::struct_numby ... ok
test tests::thing_booly ... ok
test tests::thing_stringy ... ok
test tests::thing_enumy ... ok
test tests::thing_numby ... FAILED
failures:
---- tests::thing_numby stdout ----
thread 'tests::thing_numby' panicked at 'couldn't parse: Error("invalid type: map, expected u8", line: 0, column: 0)', src/lib.rs:25:73
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
failures:
tests::thing_numby
test result: FAILED. 4 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
error: test failed, to rerun pass '--lib'
It is only fields that are supposed to be numbers that fail to parse.