Hi. In January I asked a question on parsing: https://mail.haskell.org/pipermail/haskell-cafe/2021-January/133275.html .
I am currently writing a library, which will solve my problem. It is not finished, but so far I was able to finish and publish one component: checking grammar
for ambiguity. Here it is: https://hackage.haskell.org/package/check-cfg-ambiguity . The code is possibly ugly (ST monad), but I'm happy with this code,
and I don't plan to change it. It works. It was tested

==
Askar Safin
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