Missing option: --bar This one will not exist
You are seeing this error because at least one, but not all, of the settings in an allOrNothing (or subSettings) parser have been defined.
The following settings have been parsed:
test/OptEnvConf/ErrorSpec.hs:153:21 in main:OptEnvConf.ErrorSpec
Hit the 'empty' case of the Parser type, this should not happen.