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This implies that we remove [#] from consideration, as desired.
This means fewer facts are considered and a little time is saved.
Also, announced (in comments and assertions) that [any] is implemented as [#],
but not yet committed.

This may save some speed (not always, though)
and leads to storing much fewer facts in [T] (which saves memory).

all transitions and reductions on [error]. This leads to smaller
stars (if the grammar uses [error]), hence faster run time.

immediate feedback if it does not compile. Also fixed it to
properly show the compilation error message.

written for ocamlyacc and menhir.