fix multiple fields with the same name

cmd/gogensig/convert/type.go

@@ -361,7 +361,36 @@ func (p *TypeConv) RecordTypeToStruct(recordType *ast.RecordType) (types.Type, e
 			fields = []*types.Var{maxFld}
 		}
 	}
-	return types.NewStruct(fields, nil), nil
+	uniFields := p.uniqueFields(fields)
+	return types.NewStruct(uniFields, nil), nil
+}
+
+func genUniqueName(name string, index int, fieldMap map[string]struct{}) string {
+	newName := fmt.Sprintf("%s%d", name, index)
+	_, ok := fieldMap[newName]
+	if !ok {
+		return newName
+	}
+	return genUniqueName(name, index+1, fieldMap)
+}
+
+func (p *TypeConv) uniqueFields(fields []*types.Var) []*types.Var {
+	fieldMap := make(map[string]struct{})
+	newFields := make([]*types.Var, 0, len(fields))
+	for index, field := range fields {
+		name := field.Name()
+		_, ok := fieldMap[name]
+		if ok {
+			name = genUniqueName(field.Name(), index, fieldMap)
+			fieldVar := types.NewVar(token.NoPos, p.Types, name, field.Type())
+			newFields = append(newFields, fieldVar)
+			fieldMap[name] = struct{}{}
+		} else {
+			fieldMap[name] = struct{}{}
+			newFields = append(newFields, field)
+		}
+	}
+	return newFields
 }
 
 func (p *TypeConv) ToDefaultEnumType() types.Type {