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(and/or a way to explore the generated pex environment to see what was actually built?)

you can use `--no-process-execution-local-cleanup` to preserve the process execution directories

see <https://www.pantsbuild.org/docs/troubleshooting#debug-tip-inspect-the-chroot-with---no-process-execution-local-cleanup>

Thanks!  I'll try that in addition to my flailing with the `repl`

start by trying it with your test run, and then inspect the directory created by the test run