Thu, 27 May 2010 21:14:53 +0200 wenzelm substantial performance improvement by avoiding "re-ified" execution structure via future dependencies, instead use singleton execution (dummy future) that forces lazy state updates bottom-up;
Thu, 27 May 2010 20:15:36 +0200 wenzelm further formal thread-safety (follow-up to 88300168baf8) -- in practice there is only a single Isar toplevel loop, but this is not enforced;
Thu, 27 May 2010 18:10:37 +0200 wenzelm renamed structure PrintMode to Print_Mode, keeping the old name as legacy alias for some time;
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