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I'm working on that `stdin` RFE that I requested.  This is my first time crossing into the Rust domain.  Somehow I introduced a hang.  I've added a bunch of `debug!` calls, but I can't figure out how to enable them when running under `pants test`.  I did add `RUST_LOG=debug` into the `extra_env_vars` of the `[test]` section in `pants.toml` but that didn't do it.  And just setting it on the command line doesn't work either.  Any suggestions on where I should set it?

You should set `RUST_LOG` when invoking Pants, e.g. `RUST_LOG=debug ./pants -ldebug --log-show-rust-3rdparty ...`

If you are using the Pants integration testing helper, you'd need to pass such options to the Pants invocation that your test makes.

With `RuleRunner`, you may need to pass parameters via `.set_options`.

Thanks!  This got me the output I needed to find my infinite loop.