include flag name when erroring on env default #1
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Signed-off-by: Jamie Klassen <cklassen@pivotal.io>
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This addresses concourse/concourse#5429 (comment).
This is absolutely necessary -- if you are passing many flags via environment variables, it can be very mysterious to determine which one is invalid. Frankly, my discoveries here and here were very lucky.
Also I quieted the parser test. By adding a test that had a parse error, we were actually clogging the output stream of the test runner.