I'd expect it indicates the the symbol being read is not accessible, that is, not reachable from the start symbol. The message isn't of the best -- it talks too much about the internals. Was there a warning message that you have an inaccessible symbol?

-- jeffrey

On 01/18/2014 05:45 AM, Durand Jean-Damien wrote:
Jeffrey,

Another question:

Is the message "Problem in u_read(), alternative() failed: Token symbol is inaccessible at /usr/local/lib/perl/5.18.2/Marpa/R2/SLR.pm line 881" expected to be a problem in the user's grammar or in the SLIF internals ?

This is with 2.07901.

Thanks / JD.

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