Mumps-style “dotted do” notation example

FT                                      # A label (for jumping to)
  NEW X,MSG2
  I $$RDVALS^MISC22()=SUCCESS DO QUIT   # The second space between DO and QUIT is significant
  . S X="DO ACTN5^ACTNS"
  . X X                                 # The two Xs mean different things (Cache' is not a context-free language)
  . S MSG2=MSG_" succeeded."            # Expect MSG to float in from somewhere else
  E DO
  . S ERRMSG=INVALIDREADMSG
  . W 1/0
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