allPatternIsRoot: allPatternIsRoot,

		listRoots: func(rs *Requirements) (roots []string) {
			updateMatches(rs, nil)
			for _, m := range matches {
				roots = append(roots, m.Pkgs...)
			}
			return roots
		},
	})

	// One last pass to finalize wildcards.
	updateMatches(ld.requirements, ld)

	// List errors in matching patterns (such as directory permission