VMS Help  —  FORTRAN  /D_LINES D=/NOD_LINES
  /[NO]D_LINES

  Specifies that the compiler should treat fixed-format lines that
  contain a D in column 1 as source code rather than comment lines.

  The default is /NOD_LINES, which means that fixed-format lines with
  a D in column 1 are treated as comments.

  This qualifier is ignored for free-format source code.
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