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Syntactic Conventions
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   Fortran mode assumes that you follow certain conventions that
simplify the task of understanding a Fortran program well enough to
indent it properly:

   * Two nested `do' loops never share a `continue' statement.

   * Fortran keywords such as `if', `else', `then', `do' and others are
     written without embedded whitespace or line breaks.

     Fortran compilers generally ignore whitespace outside of string
     constants, but Fortran mode does not recognize these keywords if
     they are not contiguous.  Constructs such as `else if' or `end do'
     are acceptable, but the second word should be on the same line as
     the first and not on a continuation line.

If you fail to follow these conventions, the indentation commands may
indent some lines unaesthetically.  However, a correct Fortran program
retains its meaning when reindented even if the conventions are not
followed.