[isabelle-dev] polyml-test-b68438d33c69

[Makarius]

With Isabelle/76f2d492627e we are on polyml-test-b68438d33c69: it is
already fairly stable, but there are still some sporadic crashes,
notably on slow machines (e.g. for "isabelle build HOL" on lxbroy10 or
my macMini at home). On high-end machines, I can build all of Isabelle +
AFP without problems.

We do continue monotonically towards a stable Poly/ML version: David
Matthews has already sorted out various subtle issues on
https://github.com/polyml/polyml/commits/master -- leading up to current
b68438d33c69.


	Makarius