diff -r df59faf7fa59 Python/symtable.c
--- a/Python/symtable.c	Sun Dec 11 14:43:18 2016 +0200
+++ b/Python/symtable.c	Sun Dec 11 15:04:58 2016 +0100
@@ -5,6 +5,12 @@
 #include "structmember.h"
 
 /* error strings used for warnings */
+#define GLOBAL_PARAM \
+"name '%U' is parameter and global"
+
+#define NONLOCAL_PARAM \
+"name '%U' is parameter and nonlocal"
+
 #define GLOBAL_AFTER_ASSIGN \
 "name '%U' is assigned to before global declaration"
 
@@ -463,8 +469,7 @@
     if (flags & DEF_GLOBAL) {
         if (flags & DEF_PARAM) {
             PyErr_Format(PyExc_SyntaxError,
-                        "name '%U' is parameter and global",
-                        name);
+                         GLOBAL_PARAM, name);
             return error_at_directive(ste, name);
         }
         if (flags & DEF_NONLOCAL) {
@@ -483,8 +488,7 @@
     if (flags & DEF_NONLOCAL) {
         if (flags & DEF_PARAM) {
             PyErr_Format(PyExc_SyntaxError,
-                         "name '%U' is parameter and nonlocal",
-                         name);
+                         NONLOCAL_PARAM, name);
             return error_at_directive(ste, name);
         }
         if (!bound) {
@@ -1280,6 +1284,14 @@
             long cur = symtable_lookup(st, name);
             if (cur < 0)
                 VISIT_QUIT(st, 0);
+            if (cur & DEF_PARAM) {
+                PyErr_Format(PyExc_SyntaxError,
+                             GLOBAL_PARAM, name);
+                PyErr_SyntaxLocationObject(st->st_filename,
+                                           s->lineno,
+                                           s->col_offset);
+                VISIT_QUIT(st, 0);
+            }
             if (cur & (DEF_LOCAL | USE | DEF_ANNOT)) {
                 char* msg;
                 if (cur & USE) {
@@ -1311,6 +1323,14 @@
             long cur = symtable_lookup(st, name);
             if (cur < 0)
                 VISIT_QUIT(st, 0);
+            if (cur & DEF_PARAM) {
+                PyErr_Format(PyExc_SyntaxError,
+                             NONLOCAL_PARAM, name);
+                PyErr_SyntaxLocationObject(st->st_filename,
+                                           s->lineno,
+                                           s->col_offset);
+                VISIT_QUIT(st, 0);
+            }
             if (cur & (DEF_LOCAL | USE | DEF_ANNOT)) {
                 char* msg;
                 if (cur & USE) {