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error-prone has found StreamResourceLeak defect in jdk.internal.ed module:
src/jdk.internal.ed/share/classes/jdk/internal/editor/external/ExternalEditor.java:192: warning: [StreamResourceLeak] Streams that encapsulate a closeable resource should be closed using try-with-resources
saveHandler.accept(Files.lines(tmpfile).collect(Collectors.joining("\n", "", "\n")));
^
(see https://errorprone.info/bugpattern/StreamResourceLeak.md)
Did you mean 'try (Stream stream = Files.lines(tmpfile)) {'?

relates to

Task - A task that needs to be done. JDK-8209331 experimenting w/ error-prone