cpan/libmarpa/dev/api.texi<https://github.com/jeffreykegler/Marpa--R2/blob/master/cpan/libmarpa/dev/api.texi>
[1] says
it "typically indicates an application error", so internals are less likely.

[1] @deftypevr Macro int MARPA_ERR_INACCESSIBLE_TOKEN
This error code indicates that
indicates that
the token symbol is an inaccessible symbol --- one which
cannot be reached from the start symbol.

Since the inaccessibility of a symbol is a property of the grammar,
this error code typically indicates an application error.
Nevertheless, a retry at this location, using another token ID,
may succeed.
At this writing,
the author knows of no uses of this technique.

Numeric value: 18.
Suggested message: "Token symbol is inaccessible".
@end deftypevr


On Sat, Jan 18, 2014 at 3:45 PM, Durand Jean-Damien <
[email protected]> 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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