Update for 0.18.0

cmd/gen/parser/struct.go

@@ -118,6 +118,7 @@ func (s *StructParser) Parse() ([]Item, error) {
 }
 
 func (s *StructParser) parseStructFields() ([]Field, error) {
+	encountered := map[string]struct{}{}
 	var out []Field
 	for {
 		line, err := s.r.ReadString('\n')
@@ -144,6 +145,12 @@ func (s *StructParser) parseStructFields() ([]Field, error) {
 			continue
 		}
 
+		if _, ok := encountered[sm[1]]; ok {
+			continue
+		} else {
+			encountered[sm[1]] = struct{}{}
+		}
+
 		out = append(out, Field{
 			OrigName: sm[1],
 			Name:     s.TransformName(sm[1]),