The messages would look like this:
  warn:legacy.osl:28639:1:svx/source/fmcomp/gridcell.cxx:255: caught an exception!

I introduced this bug in commit 6a043e9c
"Use the new type-checking Reference constructor to reduce code noise"

Change-Id: I922d46f7c7eefbc12892a2525b30dcb798619a8b