Test case created with:
$ javac hello.java
$ jar -cf hello.jar hello.class

"Fixed" version is our output.

The primary exported name is Config, so it's better to call this
config.

The tests started failing with:
fatal runtime error: IO Safety violation: owned file descriptor already closed
(rust-1.80.0-1.fc40.x86_64)

It seems that we were trying to close the fd from two places
and somehow this didn't cause an error before.

With interleaved logs from many workers, it can be hard to to figure
out which worker is logging what.