Simplify p_positional_and_keyword_args with s.peek()

Cython/Compiler/Parsing.py

@@ -1747,15 +1747,10 @@ def p_positional_and_keyword_args(s, end_sy_set, type_positions=(), type_keyword
 
         was_keyword = False
         parsed_type = False
-        if s.sy == 'IDENT':
-            # Since we can have either types or expressions as positional args,
-            # we use a strategy of looking an extra step forward for a '=' and
-            # if it is a positional arg we backtrack.
+        if s.sy == 'IDENT' and s.peek()[0] == '=':
             ident = s.systring
+            s.next() # s.sy is '='
             s.next()
-            if s.sy == '=':
-                s.next()
-                # Is keyword arg
             if type_keywords is None or ident in type_keywords:
                 base_type = p_c_base_type(s)
                 declarator = p_c_declarator(s, empty = 1)
@@ -1768,10 +1763,8 @@ def p_positional_and_keyword_args(s, end_sy_set, type_positions=(), type_keyword
                 arg.pos, value = EncodedString(ident))
             keyword_args.append((keyword_node, arg))
             was_keyword = True
-            else:
-                s.put_back('IDENT', ident)
                 
-        if not was_keyword:
+        else:
             if type_positions is None or pos_idx in type_positions:
                 base_type = p_c_base_type(s)
                 declarator = p_c_declarator(s, empty = 1)