cmd/go/internal/modload: delete unused *mvsReqs.next method

For #36460
Updates #36465

Change-Id: Id818dce21d39a48cf5fc9c015b30497dce9cd1ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/278596
Trust: Bryan C. Mills <[email protected]>
Run-TryBot: Bryan C. Mills <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Jay Conrod <[email protected]>
Reviewed-by: Michael Matloob <[email protected]>

Author: Bryan C. Mills

src/cmd/go/internal/modload/mvs.go

@@ -111,19 +111,3 @@ func (*mvsReqs) Previous(m module.Version) (module.Version, error) {
 	}
 	return module.Version{Path: m.Path, Version: "none"}, nil
 }
-
-// next returns the next version of m.Path after m.Version.
-// It is only used by the exclusion processing in the Required method,
-// not called directly by MVS.
-func (*mvsReqs) next(m module.Version) (module.Version, error) {
-	// TODO(golang.org/issue/38714): thread tracing context through MVS.
-	list, err := versions(context.TODO(), m.Path, CheckAllowed)
-	if err != nil {
-		return module.Version{}, err
-	}
-	i := sort.Search(len(list), func(i int) bool { return semver.Compare(list[i], m.Version) > 0 })
-	if i < len(list) {
-		return module.Version{Path: m.Path, Version: list[i]}, nil
-	}
-	return module.Version{Path: m.Path, Version: "none"}, nil
-}