[isabelle-dev] Debugging low-level exceptions

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Sat Mar 16 16:24:18 CET 2013

Hi Alex,

> 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).

you have to watch the »Raw output« buffer (via Plugins -> Isabelle).

Hope this helps,


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