[Issue 4567] dmd should print the dmd.conf and env vars it's using when it fails

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=4567

--- Comment #1 from hst...@quickfur.ath.cx ---
Running dmd -v does print out which config file it's using. Would that be good
enough?

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