fix application bug

vendor/golang.org/x/text/internal/gen/code.go

@@ -48,7 +48,7 @@ func NewCodeWriter() *CodeWriter {
 }
 
 // WriteGoFile appends the buffer with the total size of all created structures
-// and writes it as a Go file to the the given file with the given package name.
+// and writes it as a Go file to the given file with the given package name.
 func (w *CodeWriter) WriteGoFile(filename, pkg string) {
 	f, err := os.Create(filename)
 	if err != nil {
@@ -61,12 +61,14 @@ func (w *CodeWriter) WriteGoFile(filename, pkg string) {
 }
 
 // WriteVersionedGoFile appends the buffer with the total size of all created
-// structures and writes it as a Go file to the the given file with the given
+// structures and writes it as a Go file to the given file with the given
 // package name and build tags for the current Unicode version,
 func (w *CodeWriter) WriteVersionedGoFile(filename, pkg string) {
 	tags := buildTags()
 	if tags != "" {
-		filename = insertVersion(filename, UnicodeVersion())
+		pattern := fileToPattern(filename)
+		updateBuildTags(pattern)
+		filename = fmt.Sprintf(pattern, UnicodeVersion())
 	}
 	f, err := os.Create(filename)
 	if err != nil {
@@ -79,10 +81,12 @@ func (w *CodeWriter) WriteVersionedGoFile(filename, pkg string) {
 }
 
 // WriteGo appends the buffer with the total size of all created structures and
-// writes it as a Go file to the the given writer with the given package name.
+// writes it as a Go file to the given writer with the given package name.
 func (w *CodeWriter) WriteGo(out io.Writer, pkg, tags string) (n int, err error) {
 	sz := w.Size
-	w.WriteComment("Total table size %d bytes (%dKiB); checksum: %X\n", sz, sz/1024, w.Hash.Sum32())
+	if sz > 0 {
+		w.WriteComment("Total table size %d bytes (%dKiB); checksum: %X\n", sz, sz/1024, w.Hash.Sum32())
+	}
 	defer w.buf.Reset()
 	return WriteGo(out, pkg, tags, w.buf.Bytes())
 }
@@ -199,7 +203,6 @@ func (w *CodeWriter) writeValue(v reflect.Value) {
 
 // WriteString writes a string literal.
 func (w *CodeWriter) WriteString(s string) {
-	s = strings.Replace(s, `\`, `\\`, -1)
 	io.WriteString(w.Hash, s) // content hash
 	w.Size += len(s)
 
@@ -250,6 +253,9 @@ func (w *CodeWriter) WriteString(s string) {
 				out = fmt.Sprintf("\\U%08x", r)
 			}
 			chars = len(out)
+		} else if r == '\\' {
+			out = "\\" + string(r)
+			chars = 2
 		}
 		if n -= chars; n < 0 {
 			nLines++