make _PyParser_TokenNames const

Include/token.h

@@ -75,7 +75,7 @@ extern "C" {
 #define ISEOF(x)		((x) == ENDMARKER)
 
 
-PyAPI_DATA(char *) _PyParser_TokenNames[]; /* Token names */
+PyAPI_DATA(const char *) _PyParser_TokenNames[]; /* Token names */
 PyAPI_FUNC(int) PyToken_OneChar(int);
 PyAPI_FUNC(int) PyToken_TwoChars(int, int);
 PyAPI_FUNC(int) PyToken_ThreeChars(int, int, int);

Parser/tokenizer.c

@@ -47,7 +47,7 @@ static void tok_backup(struct tok_state *tok, int c);
 
 /* Token names */
 
-char *_PyParser_TokenNames[] = {
+const char *_PyParser_TokenNames[] = {
     "ENDMARKER",
     "NAME",
     "NUMBER",