// the conflict. Find the next-lowest candidate and apply it.
			rejectedRoot[m] = true
			prev := m
			for {
				prev, err = previousVersion(ctx, prev)
				if gover.ModCompare(m.Path, m.Version, origV) > 0 && (gover.ModCompare(m.Path, prev.Version, origV) < 0 || err != nil) {
					// previousVersion skipped over origV. Insert it into the order.
					prev.Version = origV
				} else if err != nil {

		if i > 0 {
			prev := rootModules[i-1]
			if prev.Path > m.Path || (prev.Path == m.Path && gover.ModCompare(m.Path, prev.Version, m.Version) > 0) {
				panic(fmt.Sprintf("newRequirements called with unsorted roots: %v", rootModules))
			}
		}

		if v, ok := rs.maxRootVersion[m.Path]; ok && gover.ModCompare(m.Path, v, m.Version) >= 0 {
			continue
		}
		rs.maxRootVersion[m.Path] = m.Version
	}

		// authenticated.
		return
	} else if err != nil {
		if m.Error == nil {
			m.Error = &modinfo.ModuleError{Err: err.Error()}
		}
		return
	}

	if gover.ModCompare(m.Path, info.Version, m.Version) > 0 {
		m.Update = &modinfo.ModulePublic{
			Path:    m.Path,
			Version: info.Version,
			Time:    &info.Time,
		}
	}
}

				} else {
					mv = module.ZeroPseudoVersion("v0")
				}
			}
			mg, err := rs.Graph(ctx)
			if err != nil {
				return module.Version{}, err
			}
			if gover.ModCompare(mp, mg.Selected(mp), mv) >= 0 {
				// We can't resolve the import by adding mp@mv to the module graph,
				// because the selected version of mp is already at least mv.
				continue
			}

			continue
		}
		r.work.Add(func() {
			if _, err := modfetch.DownloadZip(ctx, mActual); err != nil {
				verb := "upgraded"
				if gover.ModCompare(m.Path, m.Version, old.Version) < 0 {
					verb = "downgraded"
				}
				replaced := ""
				if mActual != m {
					replaced = fmt.Sprintf(" (replaced by %s)", mActual)
				}

		}
		replacedByWorkFile[r.Old.Path] = true
		v, ok := mainModules.highestReplaced[r.Old.Path]
		if !ok || gover.ModCompare(r.Old.Path, r.Old.Version, v) > 0 {
			mainModules.highestReplaced[r.Old.Path] = r.Old.Version
		}
		replacements[r.Old] = r.New
	}
	for i, m := range ms {
		mainModules.pathPrefix[m] = m.Path