[isabelle-dev] Option raised errors hides other error failures

Lukas Bulwahn bulwahn at in.tum.de
Fri Sep 9 14:20:11 CEST 2011

Hello all,

lately, I have noticed that the exception handling within the 
non-interactive execution has changed, disguising the true origin of 

In my concrete case:

When running the compilation within the make command, I get:

*** exception Option raised
Exception- TOPLEVEL_ERROR raised
*** ML error

Whereas running it interactively in PG:

*** exception Match raised
*** At command "code_reflect"

The Match raised is the real reason for the exception in my case, and 
the one I was expecting.
The Option raised exception seems to caused somehow as a consequence of 
the previous exception within the non-interactive run.

Is this an intended behaviour?
If so, it might be good to know for other developers, not to be mislead 
by the error message.


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