Index: Python/ast.c
===================================================================
--- Python/ast.c	(revision 61629)
+++ Python/ast.c	(working copy)
@@ -349,9 +349,17 @@
 
     switch (e->kind) {
         case Attribute_kind:
-            if (ctx == Store &&
-                !strcmp(PyString_AS_STRING(e->v.Attribute.attr), "None")) {
-                return ast_error(n, "assignment to None");
+            if (ctx == Store) {
+                char *attr = PyString_AS_STRING(e->v.Attribute.attr);
+                if (!strcmp(attr, "None")) {
+                    return ast_error(n, "assignment to None");
+                }
+                if (Py_Py3kWarningFlag &&
+                    !(strcmp(attr, "True") && strcmp(attr, "False")) &&
+                    PyErr_WarnEx(PyExc_DeprecationWarning, 
+                        "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                    return 0;
+                }
             }
             e->v.Attribute.ctx = ctx;
             break;
@@ -359,9 +367,17 @@
             e->v.Subscript.ctx = ctx;
             break;
         case Name_kind:
-            if (ctx == Store &&
-                !strcmp(PyString_AS_STRING(e->v.Name.id), "None")) {
+            if (ctx == Store) {
+                char *id = PyString_AS_STRING(e->v.Name.id);
+                if (!strcmp(id, "None")) {
                     return ast_error(n, "assignment to None");
+                }
+                if (Py_Py3kWarningFlag &&
+                    !(strcmp(id, "True") && strcmp(id, "False")) &&
+                    PyErr_WarnEx(PyExc_DeprecationWarning, 
+                        "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                    return 0;
+                }
             }
             e->v.Name.ctx = ctx;
             break;
@@ -583,7 +599,13 @@
             if (!strcmp(STR(child), "None")) {
                 ast_error(child, "assignment to None");
                 return NULL;
-            }   
+            }
+            if (Py_Py3kWarningFlag &&
+                !(strcmp(STR(child), "True") && strcmp(STR(child), "False")) &&
+                PyErr_WarnEx(PyExc_DeprecationWarning, 
+                    "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                return NULL;
+            }
             arg = Name(NEW_IDENTIFIER(child), Store, LINENO(child),
                        child->n_col_offset, c->c_arena);
         }
@@ -697,6 +719,13 @@
                         ast_error(CHILD(ch, 0), "assignment to None");
                         goto error;
                     }
+                    if (Py_Py3kWarningFlag &&
+                        !(strcmp(STR(CHILD(ch, 0)), "True") &&
+                        strcmp(STR(CHILD(ch, 0)), "False")) &&
+                        PyErr_WarnEx(PyExc_DeprecationWarning, 
+                            "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                        goto error;
+                    }
                     name = Name(NEW_IDENTIFIER(CHILD(ch, 0)),
                                 Param, LINENO(ch), ch->n_col_offset,
                                 c->c_arena);
@@ -712,6 +741,13 @@
                     ast_error(CHILD(n, i+1), "assignment to None");
                     goto error;
                 }
+                if (Py_Py3kWarningFlag &&
+                    !(strcmp(STR(CHILD(n, i+1)), "True") &&
+                    strcmp(STR(CHILD(n, i+1)), "False")) &&
+                    PyErr_WarnEx(PyExc_DeprecationWarning, 
+                        "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                    goto error;
+                }
                 vararg = NEW_IDENTIFIER(CHILD(n, i+1));
                 i += 3;
                 break;
@@ -720,6 +756,13 @@
                     ast_error(CHILD(n, i+1), "assignment to None");
                     goto error;
                 }
+                if (Py_Py3kWarningFlag &&
+                    !(strcmp(STR(CHILD(n, i+1)), "True") &&
+                    strcmp(STR(CHILD(n, i+1)), "False")) &&
+                    PyErr_WarnEx(PyExc_DeprecationWarning, 
+                        "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                    goto error;
+                }
                 kwarg = NEW_IDENTIFIER(CHILD(n, i+1));
                 i += 3;
                 break;
@@ -846,6 +889,13 @@
         ast_error(CHILD(n, name_i), "assignment to None");
         return NULL;
     }
+    else if (Py_Py3kWarningFlag &&
+        !(strcmp(STR(CHILD(n, name_i)), "True") &&
+        strcmp(STR(CHILD(n, name_i)), "False")) &&
+        PyErr_WarnEx(PyExc_DeprecationWarning, 
+            "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+        return NULL;
+    }
     args = ast_for_arguments(c, CHILD(n, name_i + 1));
     if (!args)
         return NULL;
@@ -1923,6 +1973,13 @@
                     ast_error(CHILD(ch, 0), "assignment to None");
                     return NULL;
                 }
+                if (Py_Py3kWarningFlag &&
+                    !(strcmp(PyString_AS_STRING(key), "True") &&
+                    strcmp(PyString_AS_STRING(key), "False")) &&
+                    PyErr_WarnEx(PyExc_DeprecationWarning, 
+                        "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+                    return NULL;
+                }
                 e = ast_for_expr(c, CHILD(ch, 2));
                 if (!e)
                     return NULL;
@@ -2053,6 +2110,15 @@
                     ast_error(ch, "assignment to None");
                     return NULL;
                 }
+                if (Py_Py3kWarningFlag) {
+                    if (!(strcmp(var_name, "True") &&
+                        strcmp(var_name, "False")) &&
+                        PyErr_WarnEx(PyExc_DeprecationWarning, 
+                            "Assignment to True or False is forbidden in 3.x.",
+                            2) < 0) {
+                        return NULL;
+                    }
+                }
                 break;
             }
             case Attribute_kind:
@@ -2999,6 +3065,13 @@
             ast_error(n, "assignment to None");
             return NULL;
     }
+    if (Py_Py3kWarningFlag &&
+        !(strcmp(STR(CHILD(n, 1)), "True") &&
+        strcmp(STR(CHILD(n, 1)), "False")) &&
+        PyErr_WarnEx(PyExc_DeprecationWarning, 
+            "Assignment to True or False is forbidden in 3.x.", 2) < 0) {
+        return NULL;
+    }
 
     if (NCH(n) == 4) {
         s = ast_for_suite(c, CHILD(n, 3));