Making type checker happy

Author: kohsuke

smart_tests/test_runners/bazel.py

@@ -74,7 +74,7 @@ def f(case: TestCase, suite: TestSuite, report_file: str) -> TestPath:
     client.path_builder = f
     client.check_timestamp = False
 
-    def parse_func(report: str) -> ET.ElementTree:
+    def parse_func(report: str) -> ET.ElementTree[ET.Element]:
         """
         test result XML generated by Bazel's java_test rule (and possibly others) do not capture system-out/system-err.
         The whole thing gets captured separately as test.log file in the same directory as test.xml.