title: jade doesn't let me use include #{variable} in a mixin
body: <p>I want to print an include as a result of a mixin, but jade wants to parse the include when it first reads the mixin.</p>
  
  <pre><code>mixin myHeader(name)
    div#{name} 
      h1 #{name}
        include #{name}
  
  
  !!! html
    html
      head
      body
        +myHeader(#home)
        +myHeader(#schedule)
        +myHeader(#map)
        +myHeader(#lecturers)
  </code></pre>
  
  <p>I think the error is telling me jade can't find #{name} to include in the mixin.</p>
  
  <p>ENOENT, no such file or directory '#{name}.jade'</p>