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+%% Test case for built-in ISERROR function.
+%mode init
+A1:10
+A2=10/2
+A3=2/0
+A4=NonExistingName
+B1=ISERROR(A1)
+B2=ISERROR(A2)
+B3=ISERROR(A3)
+B4=ISERROR(A4)
+C4=ISERROR(5.2)
+C5=ISERROR("inline text")
+C6=ISERROR(NA())
+%calc
+%mode result
+B1=false
+B2=false
+B3=true
+B4=true
+C4=false
+C5=false
+C6=true
+%check
+