If a file compiled with the XREF option is subject to block-level or routine-level UNDO, THROW behavior, the XREF output includes one of the following lines:

<compile file_name> <file_name> <line #> ROUTINE-LEVEL ON ERROR UNDO, THROW
<compile file_name> <file_name> <line #> BLOCK-LEVEL ON ERROR UNDO, THROW

The line, if present, is usually the first line in the listing for the applicable file, and in all cases is near the top of the listing.

Similarly, if the file is compiled with the XREF-XML option, the XML output includes an entry like the following ("BLOCK-LEVEL" replaces "ROUTINE-LEVEL" as appropriate):

<Reference Reference-type="ROUTINE-LEVEL" Object-identifier="">
      <Source-guid>xX6qZFj+b6fhERbFDfGViA</Source-guid>
      <File-num>1</File-num>
      <Ref-seq>3</Ref-seq>
      <Line-num>1</Line-num>
      <Object-context>ON ERROR UNDO, THROW</Object-context>
      <Access-mode/>
      <Data-member-ref/>
      <Temp-ref/>
      <Detail/>
      <Is-static>false</Is-static>
      <Is-abstract>false</Is-abstract>
</Reference>