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After fix for JDK-8156738, nashorn nightly build fails with the following:
LinkedCallSiteLocationTest.java: 74
    [javac]         return StackWalker.getInstance().walk(s -> s.skip(1).findFirst().get().getLineNumber().getAsInt());
    [javac]                                                                                              
This is because the StackWalker API has been changed as part of 
JDK-8153912 (Reconsider StackFrame::getFileName and StackFrame::getLineNumber). getLineNumber() returns int rather than an OptionalInt