NEW:      Unrecoverable error messages
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     Unrecoverable errors are runtime errors that for some reason cannot make
     use of the error system.  The following runtime unrecoverable error
     messages are now documented:

     24                 Write error
     331                String/array memory overflow
     332                String/array memory overflow
     415                Cannot open overlay file
     5302               Conventional memory exhausted
     5304               Conventional memory exhausted
     5306               Conventional memory exhausted
     5312               VM swap file over allocated