cargo-nextest 0.9.43

Nextest is now built with Rust 1.65. This version of Rust is the first one to spawn processes using posix_spawn rather than fork/exec on macOS, which should lead to performance benefits in some cases.

For example, on an M1 Mac Mini, with the clap repository at 520145e, and the command cargo nextest run -E 'not (test(ui_tests) + test(example_tests))':

• Before: 0.636 seconds
• After: 0.284 seconds (2.23x faster)

This is a best-case scenario; tests that take longer to run will generally benefit less.

Added

• The threads-required configuration now supports the
  values "num-cpus", for the total number of logical CPUs available, and "num-test-threads", for the
  number of test threads nextest is running with.
• Nextest now prints a warning if a configuration setting is unknown.

Fixed

• Configuring retries = 0 now works correctly. Thanks xxchan for your first contribution!