--test-threads override doesn't work

[def-]

The README states:

All the tests are run with RUST_TEST_THREADS=1 to work around [https://github.com/rust-lang/rust/issues/91092]. You can pass --test-threads (e.g., --test-threads=$(nproc)) to override this behavior. (As for nextest, we also set NEXTEST_TEST_THREADS=1.)

But in nextest --test-threads seems to be ignored when NEXTEST_TEST_THREADS=1 is set. Could cargo-llvm-cov detect --test-threads being set and not set NEXTEST_TEST_THREADS=1 then?

[taiki-e]

Please tell us what the full command you used is.

[def-]

cargo llvm-cov nextest --test-threads=16 --no-clean --no-fail-fast
I'm still seeing only one test being executed at a time, runs for about an hour.
Edit: Actually, towards the end the number of tests running is going up, but stays around 1-2 during the start, strange.

[def-]

This appears to be a problem on my side, sorry.

[taiki-e]

FYI, since cargo-llvm-cov 0.5.20, we no longer set RUST_TEST_THREADS/NEXTEST_TEST_THREADS and now adopt a more efficient alternative to workaround rustc bug.