False negatives in Rust code coverage

[praseodym]

The Rust code coverage has some obvious false negatives in lines with only a constant value, e.g. in backend/src/error.rs:

Related: xd009642/tarpaulin#351

[praseodym]

Another project (EnergySystemsModellingLab/MUSE_2.0#236) switched to cargo-llvm-cov, I'm going to give that a try.

[praseodym]

cargo-llvm-cov looks a lot better, the same lines in backend/src/error.rs are now properly covered:

And cargo-llvm-cov also works with Rust stable (Tarpaulin required Rust nightly), which makes it easier to integrate into our regular backend build job.

[Lionqueen94]

cargo-llvm-cov looks a lot better, the same lines in backend/src/error.rs are now properly covered: And cargo-llvm-cov also works with Rust stable (Tarpaulin required Rust nightly), which makes it easier to integrate into our regular backend build job.

I think it did state that branch coverage only works with nightly: "Generate very precise coverage data. (line, region, and branch coverage. branch coverage is currently optional and requires nightly, see taiki-e/cargo-llvm-cov#8 for more)"