I'm having what I supose ti be a oarsec internal error when trying to compile some grammar.

 

I get:

$ happy -g -a -c Parser.y

happy: parE

 

Is this a known bug? I could find no reference to it.

 

I'm using happy version 1.16 and I can't reduce the problem to a single production.

The grammar file is attached.

 

Thanks in advance,