add another test and propagate DEF_COMP_CELL

Lib/test/test_listcomps.py

@@ -391,6 +391,21 @@ def f():
         """
         self._check_in_scopes(
             code, {"x": 2}, ns={"b": 2}, scopes=["function", "module"])
+        # inside a class, the `a = 1` assignment is not visible
+        self._check_in_scopes(code, raises=NameError, scopes=["class"])
+
+    def test_cell_in_nested_comprehension(self):
+        code = """
+            a = 1
+            def f():
+                [[lambda: b for b in c] + [b] for c in [[a]]]
+                return b
+            x = f()
+        """
+        self._check_in_scopes(
+            code, {"x": 2}, ns={"b": 2}, scopes=["function", "module"])
+        # inside a class, the `a = 1` assignment is not visible
+        self._check_in_scopes(code, raises=NameError, scopes=["class"])
 
     def test_name_error_in_class_scope(self):
         code = """

Python/symtable.c

@@ -645,7 +645,7 @@ inline_comprehension(PySTEntryObject *ste, PySTEntryObject *comp,
         }
         int scope = (comp_flags >> SCOPE_OFFSET) & SCOPE_MASK;
         int only_flags = comp_flags & ((1 << SCOPE_OFFSET) - 1);
-        if (scope == CELL) {
+        if (scope == CELL || only_flags & DEF_COMP_CELL) {
             if (PySet_Add(inlined_cells, k) < 0) {
                 return 0;
             }