// module is in the module cache or if the -modfile flag is used.
//
// The default output is to print the module path and then
// information about the version and replacement if any.
// For example, 'go list -m all' might print:
//
//	my/main/module
//	golang.org/x/text v0.3.0 => /tmp/text
//	rsc.io/pdf v0.1.1
//

		if visited[p1] {
			continue
		}
		visited[p1] = true
		if p1.Module != nil {
			m := module.Version{Path: p1.Module.Path, Version: p1.Module.Version}
			if p1.Module.Path != main.Path && mdeps[m] == nil {
				mdeps[m] = debugModFromModinfo(p1.Module)
			}
		}
		q = append(q, p1.Internal.Imports...)
	}
	sortedMods := make([]module.Version, 0, len(mdeps))
	for mod := range mdeps {