Possible bug in scanner

David Balmain dbalm... at gmail.com
Sat Apr 19 09:34:28 UTC 2008

Hey folks,

I think I may have found a bug in the scanner. Not sure if this is the
best place to post bug reports but I couldn't find anywhere else on
the website.

Here's my machine definition. I've simplified it as much as possible;

    machine Word;

    main := |*
        'a' {PUTS("a: ");};
        [ab]+ . 'c' {PUTS("abc: ");};

To run it, get the full code here;

Basically I'm running this with the string "ba a". What I'd expect to
happen is that the "[ab]+ . 'c'" expression would match 'ba' then fail
and then the "any" rule would consume the 'b' then 'a' would match
twice. Unfortunately, only the second 'a' matches.

If I run this with the string "ba" I get a segfault which also seems
to indicate a bug. Perhaps I'm just doing something wrong?


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