Seems like a bug to me. We should only accept "none" and "full".
I am working on it right now, it should be easy to fix. 

Thanks for reporting!

On 19/01/2020, 15:27, "bug-bison on behalf of Hans Åberg" 
<bug-bison-bounces+avogelsgesang=tableau....@gnu.org on behalf of 
haber...@telia.com> wrote:

    
    > On 19 Jan 2020, at 14:53, Akim Demaille <a...@lrde.epita.fr> wrote:
    > 
    > Adrian Vogelsgesang contributed lookahead correction for C++.
    
    How do you know this has been enabled? —For example, this is legal:
      %define parse.lac anything
    
    
    
    
    

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