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CC, /DIAGNOSTICS
 *Conan The Librarian 

     /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.
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