Revert "tester: use new stacktrace syntax where possible"
Revert "tester: use new stacktrace syntax where possible"

This reverts commit 216fe1c346a02e4dc933f226002c8e06a20ec631.

scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris