[patch] Catch exceptions in dump_prefix_expression

[Tom Tromey]

>>>>> "Doug" == Doug Evans <dje@google.com> writes:

Doug> While playing with implementing typeof I ran into behaviour which
Doug> changes depending on whether "set debug exp" was set,
Doug> which shouldn't happen.

Doug> I will check this in in a few days if there are no objections.

Doug> 2011-09-22  Doug Evans  <dje@google.com>
Doug> 	* expprint.c (dump_prefix_expression): Don't allow exceptions to
Doug> 	leak out.

Looks good to me.

Tom