Some tweaks to names and error messages around parsing compound args.
Some tweaks to names and error messages around parsing compound args.

gcberger/scalatest,flicken/scalatest,rfries/scalatest,rfries/scalatest,matterche/scalatest,rahulkavale/scalatest,flicken/scalatest,flicken/scalatest,matterche/scalatest,flicken/scalatest,rfries/scalatest,janekdb/scalatest,dotty-staging/scalatest,dotty-staging/scalatest,triggerNZ/scalatest,janekdb/scalatest,SRGOM/scalatest,scalatest/scalatest,gcberger/scalatest,triggerNZ/scalatest,rahulkavale/scalatest,SRGOM/scalatest,dotty-staging/scalatest,rahulkavale/scalatest,gcberger/scalatest,matterche/scalatest,scalatest/scalatest,rfries/scalatest,SRGOM/scalatest,triggerNZ/scalatest,rahulkavale/scalatest,triggerNZ/scalatest,gcberger/scalatest,SRGOM/scalatest,cheeseng/scalatest,matterche/scalatest,cheeseng/scalatest,scalatest/scalatest,janekdb/scalatest,janekdb/scalatest,cheeseng/scalatest