After a lot of refinements by David Matthews we are moving towards the
new Poly/ML 5.8 release. Isabelle/8c587dd44f51 already bundles a
version of that number, without being official yet. The Isabelle NEWS
already talk about an official release:
Is it intentional that the system identifier is still 5.7.1?
This also raises the question if that variable has any remaining uses.
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