}
    }

    static class CustomSelectionRule implements AttributeDisambiguationRule<Flavor> {
        @Override
        void execute(MultipleCandidatesDetails<Flavor> details) {
            details.closestMatch(details.candidateValues.first())
        }
    }

    def "compatibility rules can mark values as compatible"() {
        def attr = Attribute.of(Flavor)

        given:

                void execute(MultipleCandidatesDetails<Thing> details) {
                    for (Thing t: details.candidateValues) {
                        if (t.name == 'blue') {
                            details.closestMatch(t)
                            return
                        }
                    }
                }
            }

            def flavor = Attribute.of('flavor', Thing)
            allprojects {

        @Override
        public void execute(MultipleCandidatesDetails<Linkage> details) {
            if (details.getCandidateValues().contains(Linkage.SHARED)) {
                details.closestMatch(Linkage.SHARED);
            }
        }
    }

                        if (candidateValues.contains("preferred")) {
                            details.closestMatch("preferred")
                        }
                        // Otherwise, use the selected value
                    } else if (candidateValues.contains(consumerValue)) {
                        details.closestMatch(consumerValue)
                    }
                }
            }