title: Implicit none, implicit conversion
body: <p>How to convert the following code which use <code>implicit none</code></p>
  
  <pre><code>module kinds
      use iso_fortran_env, only : real64, int32 
      implicit none 
      integer, parameter :: wp = real64, iwp = int32 
  end module kinds
  </code></pre>
  
  <p>to use <code>implicit</code>. I tried,</p>
  
  <pre><code>module kinds
      use iso_fortran_env, only : real64, int32 
      implicit integer (w, i)
      parameter :: wp = real64, iwp = int32 
  end module kinds 
  </code></pre>
  
  <p>but it does not work. </p>
  
  <p>My problem is how to declare a parameter using the <code>implicit</code> statement in Fortran90.</p>