Reject incombatible flag combinations in to nuon
#12595
Draft
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Description
Follow up to #12591
Ensure an error is shown.
.expect
is fine here as the precondition of reaching each branch isexplicitly that this flag has been found. Only extra care has to be
taken when changing the flag name. But that is the general risk of this
stringly typed API.
User-Facing Changes
Ineffective combinations of flags will now return a
ShellError::IncompatibleParameters
instead of returning output for which the exact behavior was previously undefined.