Wed, 06 Sep 2023 16:03:22 +0200 wenzelm add ML_system_pp for type Isabelle_Thread.T;
Wed, 06 Sep 2023 14:09:27 +0200 wenzelm more explicit type Isabelle_Thread.T;
Mon, 04 Sep 2023 21:03:13 +0200 wenzelm discontinue somewhat pointless thread tracing/debugging: without PIDE command context, messages are not shown, and Exn.trace hardly works anyway (see also de20fccf6509 and 447972249785);
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