(prot_a_type.use): Don't use +=.

(reader.getc_eofok): Ditto.
(lexer.toplevel_rarg): Ditto.
(lexer.toplevel_aarg): Ditto.

doc/checkargs.py

@@ -68,7 +68,7 @@ class prot_a_type:
         return self.__line
 
     def use(self):
-        self.__usage_count += 1
+        self.__usage_count = self.__usage_count + 1
         if self.__usage_count == 1:
             self.use_recurse()
 
@@ -242,7 +242,7 @@ class reader:
                 self.__eof = 1
                 return None
             self.__line = list(line)
-            self.__line_no += 1
+            self.__line_no = self.__line_no + 1
         ret = self.__line[0]
         del self.__line[0]
         if not self.__quoted:
@@ -548,7 +548,7 @@ class lexer:
         if not self.__args.has_key(arg):
             self.error(line_no, "undefined argument ``%s''" % (arg, ))
             return
-        self.__args[arg][1] += 1
+        self.__args[arg][1] = self.__args[arg][1] + 1
 
     def toplevel_amindex(self, arg, line_no):
         if self.__node_name != arg:
@@ -658,7 +658,7 @@ class lexer:
         if not self.__args.has_key(arg):
             self.error(line_no, "undefined argument ``%s''" % (arg, ))
             return
-        self.__args[arg][1] += 1
+        self.__args[arg][1] = self.__args[arg][1] + 1
 
     def toplevel_bye(self, arg, line_no):
         if self.__findex != None: