Bug 0876 (Problem handling two errors)

Files to reproduce error (for 5.1) are in 0876d:

Version 5.1.0, Wed Nov 22 12:31 2000
[eclipse 1]: [bug].
test_util.pl compiled traceable 3556 bytes in 0.01 seconds
calling an undefined procedure f(X) in module test_util
====== goal unexpectedly did exit_block(abort):
f(_637)
calling an undefined procedure ignore in module main
====== goal unexpectedly did exit_block(abort):
call(f(_642)) @ main
bug.pl     compiled traceable 56 bytes in 0.04 seconds
WARNING: predicate declared but not defined in run_test / 1 in module test_util


`ignore', the Tag for an exit_block, is taken to be the procedure name in
the error message in the second case.

Cheers,

Kish