[isabelle-dev] (Re-)introducing set as a type constructor rather than as mere abbreviation

[Florian Haftmann]

Hi again,

the current state of affairs concerning 'a set can be followed there:

https://isabelle.in.tum.de/isanotes/index.php/Having_%27a_set_back

Although I'd appreciate to see progress there, I do not ask to distract
any attention from tasks for the upcoming release.

Two remarks concerning the Isabelle distribution itself:
* In HOL-Nominal-Examples, equivariance in theory Fsub fails.  My
knowledge about equivariance is too restricted to decide whether this is
a mistake in the (adjustion of the) implementation or maybe needs
additional declarations etc.  I'm happy about any hints concerning this.
* The remaining issues mainly are concerned with particular tools at
which the corresponding maintainers should have a closer look at (if not
done already).

	Florian

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