Make it illegal to assign to __debug__ as per Guido's request.

diff --git a/Python/compile.c b/Python/compile.c
index 3e638ca62be5f874cb1f038003be556b51453ab7..df514c776d95ce72fef10d011b456772b3199a37 100644 (file)
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -66,6 +66,9 @@ int Py_OptimizeFlag = 0;
 #define LATE_FUTURE \
 "from __future__ imports must occur at the beginning of the file"
 
+#define ASSIGN_DEBUG \
+"can not assign to __debug__"
+
 #define MANGLE_LEN 256
 
 #define OFF(x) offsetof(PyCodeObject, x)
@@ -5181,8 +5184,16 @@ symtable_assign(struct symtable *st, node *n, int flag)
                if (TYPE(tmp) == LPAR || TYPE(tmp) == LSQB) {
                        n = CHILD(n, 1);
                        goto loop;
-               } else if (TYPE(tmp) == NAME)
+               } else if (TYPE(tmp) == NAME) {
+                       if (strcmp(STR(tmp), "__debug__") == 0) {
+                               PyErr_SetString(PyExc_SyntaxError,
+                                               ASSIGN_DEBUG);
+                               PyErr_SyntaxLocation(st->st_filename,
+                                                  n->n_lineno);
+                               st->st_errors++;
+                       }
                        symtable_add_def(st, STR(tmp), DEF_LOCAL | flag);
+               }
                return;
        case dotted_as_name:
                if (NCH(n) == 3)