Same error as in some other problems:
main.java:265: error: cannot find symbol
output += "“hidden”: " + (result.hidden ? “true” : “false”) + “,”;
^
symbol: variable hidden
location: variable result of type TestResult
1 error
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Course: https://www.educative.io/collection/5642554087309312/5679846214598656
Lesson: https://www.educative.io/collection/page/5642554087309312/5679846214598656/50003