switch r2 {
		case equivalent:
			return r1
		case inverseRelationship(r1):
			return overlaps
		default:
			return r2
		}
	default:
		panic(fmt.Sprintf("unknown relationship %q", r1))
	}
}

// If p1 has relationship `r` to p2, then
// p2 has inverseRelationship(r) to p1.
func inverseRelationship(r relationship) relationship {
	switch r {
	case moreSpecific:

		got := pat1.compareMethods(pat2)
		if got != test.want {
			t.Errorf("%s vs %s: got %s, want %s", test.p1, test.p2, got, test.want)
		}
		got2 := pat2.compareMethods(pat1)
		want2 := inverseRelationship(test.want)
		if got2 != want2 {
			t.Errorf("%s vs %s: got %s, want %s", test.p2, test.p1, got2, want2)
		}
	}
}

func TestComparePaths(t *testing.T) {
	for _, test := range []struct {