I'm sorry, it turned out to be pretty simples. The error appears when there are references to undefined terminal or non-terminal productions. That's it. Sorry for the messages, at least it might be of some help to someone else. hugo On 7/18/07, Hugo Pacheco wrote:

Hi Simon,

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, hugo