anchor.diff:   > attachments (an intersection of rectangles having a lower left
    > of (0 0) and an upper right of (width height) for each attachment).
   
  -If you want to make an fbo with differing arguments please call make-fbo
  +If you want to make an fbo with differing arguments, please call make-fbo
   with `:matching-dimensions nil` in the arguments e.g.
   
    (MAKE-FBO ~{~%     ~a~})
  
positive.code:     context)
  
  (deferror invalid-shader-gpipe-form () (pipeline-name valid-forms invalid-forms)
      "When using defpipeline to compose gpu functions the valid arguments to g-> are function literals~%(optionally with keyword stage names).~%~%In the defpipeline for ~a ~athese forms were not valid:~%~{~s~%~}~%"
    pipeline-name
    (if valid-forms
        (format nil "these forms were valid:~%~{~s~%~}~%However"
  
negative.code: 
  The problematic defintition was: ~s
  
  The problem: because of potential overloading, CEPL stages must be fully qualified.
  
  ~a"
    designator
  