def pair_fault
import cli@0.2.0.0/cli.bend as Cliimport Base
4117def pair_fault(+later: ArgInfo, earlier: Maybe<&2, ArgInfo>,
4118 groups: List<&2, String>) -> Maybe<&2, ScanFault>:
4119 match earlier:
4120 case None{}: None{}
4121 case Some{+prior}:
4122 Bool.pick(Maybe<&2, ScanFault>,
4123 pair_conflicts(later, prior, groups),
4124 Some{E07{arg_display(later), arg_display(prior)}}, None{})