[isabelle-dev] Moving towards Scala 3

[Florian Haftmann]

As an aside, changeset 010a77180dff adjusts printing of type annotation
in Scala to accommodate a subtle change of semantics in Scala 3.

As a prelude to that change, the historically grown code translating HOL
terms to intermediate language patterns has seen a substantial iterative
reworking, allowing to spot the point where pattern binding reduction
failed for hitherto unclear reasons — see changeset f9c758208298.

	Florian

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