clean up regular expression in parser (not problematic as it only matches what...

clean up regular expression in parser (not problematic as it only matches what the scanner already accepted)

Cython/Compiler/Parsing.py

@@ -1132,7 +1132,7 @@ def p_expression_or_assignment(s):
             expr = p_testlist_star_expr(s)
         expr_list.append(expr)
     if len(expr_list) == 1:
-        if re.match(r"([+*/\%^\&|-]|<<|>>|\*\*|//|@)=", s.sy):
+        if re.match(r"([-+*/%^&|]|<<|>>|\*\*|//|@)=", s.sy):
             lhs = expr_list[0]
             if isinstance(lhs, ExprNodes.SliceIndexNode):
                 # implementation requires IndexNode