module: forward to x/mod/module (#211)

The golang.org/x/mod/module is now the canonical
location of this package.

module/forward.go

@@ -0,0 +1,59 @@
+// Package module is a thin forwarding layer on top of
+// [golang.org/x/mod/module]. Note that the Encode* and
+// Decode* functions map to Escape* and Unescape*
+// in that package.
+//
+// See that package for documentation on everything else.
+package module
+
+import "golang.org/x/mod/module"
+
+type Version = module.Version
+
+func Check(path, version string) error {
+	return module.Check(path, version)
+}
+
+func CheckPath(path string) error {
+	return module.CheckPath(path)
+}
+
+func CheckImportPath(path string) error {
+	return module.CheckImportPath(path)
+}
+
+func CheckFilePath(path string) error {
+	return module.CheckFilePath(path)
+}
+
+func SplitPathVersion(path string) (prefix, pathMajor string, ok bool) {
+	return module.SplitPathVersion(path)
+}
+
+func MatchPathMajor(v, pathMajor string) bool {
+	return module.MatchPathMajor(v, pathMajor)
+}
+
+func CanonicalVersion(v string) string {
+	return module.CanonicalVersion(v)
+}
+
+func Sort(list []Version) {
+	module.Sort(list)
+}
+
+func EncodePath(path string) (encoding string, err error) {
+	return module.EscapePath(path)
+}
+
+func EncodeVersion(v string) (encoding string, err error) {
+	return module.EscapeVersion(v)
+}
+
+func DecodePath(encoding string) (path string, err error) {
+	return module.UnescapePath(encoding)
+}
+
+func DecodeVersion(encoding string) (v string, err error) {
+	return module.UnescapeVersion(encoding)
+}