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* What's new in version 0.6 / since version 0.5.15?
+- Systemtap will warn you if your script contains unused variables or
+ functions. This is helpful in case of misspelled variables. If it
+ doth protest too much, turn it off with "stap -w ...".
+
- You can add error-handling probes to a script, which are run if a
script was stopped due to errors. In such a case, "end" probes are
not run, but "error" ones are.