Looks like `cargo llvm-cov` doesn't clean up the entire `target/llvm-cov-target` directory tree, which means running the coverage script more than once fails as `mv` refuses to overwrite the leftover doctest binaries from a previous run.
There's a more complete module description for the encoder and decoder now. Both versions get appended by rustdoc, which looks wrong and shouldn't be necessary.
There's some redundancy here with the docstring examples/tests, but that's entirely on purpose:
Unfortunately, it seems that the coverage tool has trouble recognizing calls from within the docstring examples. It's an unstable feature - maybe that's why?
Even with these tests, the tool still doesn't properly detect everything. Regardless, function coverage is 100% when running the coverage tool locally.
The doctest binaries can take up ~3GB for a debug build. There's no reason to waste that much disk space and copying them is slower than moving, too. They're only used by `grcov` right now, so they needn't be preserved.
The binary path doesn't contain any doctest executables (i.e., rust_out).
Coverage reports then don't include doctests, presumably because grcov can't map the profdata references to its respective doctest binary.
Philipp Dresselmann