How to catch parsing errors?

[Guido.Bosch@loria.fr (Guido Bosch)]

Hi,

I need to know how I can catch the famous

	`SYNTAX ERROR detected at line 2'

I.e., how can I encapsulate it in LeLisp in order to detect in my
programm whether the parsing routines ({tree}:parse, {parser}:parse)
succeed or fail?

Thanks in advance 

	Guido