Add a test for the diff parser that xfails

test/test_diff_parser.py

@@ -1669,3 +1669,31 @@ def test_yet_another_backslash(differ):
     differ.initialize(code1)
     differ.parse(code2, parsers=ANY, copies=ANY, expect_error_leaves=True)
     differ.parse(code1, parsers=ANY, copies=ANY)
+
+
+@pytest.mark.xfail
+def test_very_weird_indentation(differ):
+    """
+    This test for now fails, because it's just hard to implement this, but it's
+    also not really important.
+    """
+    code1 = dedent('''\
+        def f():
+            x
+
+        def g():
+            y
+            z
+        ''')
+    code2 = dedent('''\
+        def f():
+            x
+         >\\
+        def g():
+            y
+         x
+            z
+        ''')
+
+    differ.initialize(code1)
+    differ.parse(code2, parsers=1, copies=1, expect_error_leaves=True)