/DIAGNOSTICS
       /DIAGNOSTICS[=file-spec]
       /NODIAGNOSTICS (D)

    Creates a file containing compiler diagnostic messages. The
    default file extension for a diagnostics file is .DIA. The
    diagnostics file is used with the DEC Language-Sensitive
    Editor (LSE). To display a diagnostics file, enter the command
    REVIEW/FILE=file-spec while in LSE.