[isabelle-dev] Debugging low-level exceptions

[Alexander Krauss]

Hi all,

What is the current (as of, say, d5c95b55f849) method for getting 
exception traces? I am trying to debug a low-level exception such as

   exception Match raised (line 287 of "term.ML")

which happens somewhere below partial_function. Some years ago there 
used to be "Toplevel.debug" flag, which would activate printing traces 
of any top-level errors. The closest to this I found in the current 
codebase is "Runtime.debug : bool Unsynchronized.ref", but putting

ML {*
   Runtime.debug := true;
*}

does not seem to have any effect (or I did not look in the right place).

This is Isabelle/jEdit.

Should this work? Is there something else I should use?

Alex