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Right! Before we get into a harranging match, I don't think that you studied the program output from my last post properly. If you did, then we are simply agreeing, but do not know it yet :).

The point I was making, was that on Win32, I never get any indication that your snippet crashes on my machine. Nothing. Zip. Nada. Not a jot:)

  • Nothing in the system or application event logs that always log if an program segfaults or otherwise terminates abnormally.
  • Nothing on the terminal that indicates anything is at fault--except the complete absence of your "Alive!" message. (which is something, but only in the "it didn't happen" way, and could not be classed as "a crash!".
  • No Dr. Watson, or system pop-up telling me that perl crashed in some way.

    So, by your description of "crash", I assumed you were getting some indication on your system that Perl had crashed--such as the "core dumped" message.

    If you are not getting this message, then your characterisation of this as a "crash" maybe accurate, in as much as Perl is certainly taking an abnormal path to completetion, but I usually associate the term "crash" with something the OS becomes aware of and reports, rather than (as now seems a possible interpretation of your use of that term) an internal to perl, "bottle out of here cos we're confused and don't bother telling the user anything" behaviour that I am seeing.

    To put that more clearly, calling substr in a lvalue context, with parameters that lie entirely outside the target string, causes a fatal-but-silent termination of the Perl process.

    If this is the behaviour that you are seeing under HP/UX, then I agree it is most definitely worthy of the term "Perl oddity", and I apologies for my having misunderstood you.

    It does not however, cause what I would term a "crash", at least on my system. :)

    So, are we agreeing; disagreeing; agreeing to disagree or disagreeing to agree?

    I'd like to achieve the former but I would settle for the second to last, but I think I have acquired a reputation for tending to the latter--though, of course, I disagree with that assessment :)


    Examine what is said, not who speaks.
    Silence betokens consent.
    Love the truth but pardon error.

    In reply to Re^7: substr oddity by BrowserUk
    in thread Perl oddities by brian_d_foy

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