From maechler@stat.math.ethz.ch  Tue May 29 14:11:05 2001
From: maechler@stat.math.ethz.ch (maechler@stat.math.ethz.ch)
Date: Tue, 29 May 2001 15:11:05 +0200 (MET DST)
Subject: [Rd] unbelievable parser bug (PR#956)
Message-ID: <200105291311.PAA23674@pubhealth.ku.dk>

>>>>> "FrL" == Friedrich Leisch <Friedrich.Leisch@ci.tuwien.ac.at> writes:

>>>>> On Tue, 29 May 2001 14:25:19 +0200 (MET DST),
>>>>> maechler  (m) wrote:

    >> close to ``unbelievable'' but the following line is not parsed
    >> correctly but gives a syntax error :

    >> x <- 1## A = 1


    FrL> what you don't see is that the ``spaces'' before the comment are
    FrL> no spaces: if I copy & paste the thing to a vi buffer I see:

    FrL> 	 x <- 1\xa0\xa0## A = 1

    FrL> ...

    FrL> I got the idea from sequentially deleting characters:

    >> x <- 1## A = 1
    FrL> Error: syntax error
    >> x <- 1# A = 1
    FrL> Error: syntax error
    >> x <- 1# A
    FrL> Error: syntax error
    >> x <- 1#
    FrL> Error: syntax error
    >> x <- 1
    FrL> Error: syntax error


    FrL> especially the last one look nice IMO ...

;-)  

thank you, Fritz.   
Now what about a "morale of the story" (<< probably a Germanism) ?

Don't cut and paste from e-mails any more, unless you have a really
ASCII only e-mail program or editor into which you paste.
Unfortunately, emacs doesn't seem to be among these anymore...  
aaargghh...

Martin

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[Rd] unbelievable parser bug (PR#956)
maechler@stat.math.ethz.ch