python
diff --git a/‎Lib/test/test_peg_generator/test_pegen.py
Copy file name to clipboardExpand all lines: Lib/test/test_peg_generator/test_pegen.py
+15-1Lines changed: 15 additions & 1 deletion b/‎Lib/test/test_peg_generator/test_pegen.py
Copy file name to clipboardExpand all lines: Lib/test/test_peg_generator/test_pegen.py
+15-1Lines changed: 15 additions & 1 deletion
diff --git a/‎Tools/peg_generator/pegen/python_generator.py
Copy file name to clipboardExpand all lines: Tools/peg_generator/pegen/python_generator.py
+3Lines changed: 3 additions & 0 deletions b/‎Tools/peg_generator/pegen/python_generator.py
Copy file name to clipboardExpand all lines: Tools/peg_generator/pegen/python_generator.py
+3Lines changed: 3 additions & 0 deletions
@@ -74,7 +74,7 @@ def test_typed_rules(self) -> None:
             "Rule('term', 'int', Rhs([Alt([NamedItem(None, NameLeaf('NUMBER'))])]))"
         )
 
-    def test_repeat_with_separator_rules(self) -> None:
+    def test_gather(self) -> None:
         grammar = """
         start: ','.thing+ NEWLINE
         thing: NUMBER
@@ -85,6 +85,20 @@ def test_repeat_with_separator_rules(self) -> None:
             "Rule('start', None, Rhs([Alt([NamedItem(None, Gather(StringLeaf(\"','\"), NameLeaf('thing'"
         ))
         self.assertEqual(str(rules["thing"]), "thing: NUMBER")
+        parser_class = make_parser(grammar)
+        node = parse_string("42\n", parser_class)
+        assert node == [
+            [[TokenInfo(NUMBER, string="42", start=(1, 0), end=(1, 2), line="42\n")]],
+            TokenInfo(NEWLINE, string="\n", start=(1, 2), end=(1, 3), line="42\n"),
+        ]
+        node = parse_string("1, 2\n", parser_class)
+        assert node == [
+            [
+                [TokenInfo(NUMBER, string="1", start=(1, 0), end=(1, 1), line="1, 2\n")],
+                [TokenInfo(NUMBER, string="2", start=(1, 3), end=(1, 4), line="1, 2\n")],
+            ],
+            TokenInfo(NEWLINE, string="\n", start=(1, 4), end=(1, 5), line="1, 2\n"),
+        ]
 
     def test_expr_grammar(self) -> None:
         grammar = """
 
@@ -217,6 +217,9 @@ def visit_Alt(self, node: Alt, is_loop: bool, is_gather: bool) -> None:
                     else:
                         self.print("and")
                     self.visit(item)
+                    if is_gather:
+                        self.print("is not None")
+
             self.print("):")
             with self.indent():
                 action = node.action