(define-compilation-unit haskell-utils
   (source-filename "$Y2/util/")
   (require global)
   (unit constructors
     (source-filename "constructors.scm"))
   (unit prec-utils
     (source-filename "prec-utils.scm"))
   (unit walk-ast
     (source-filename "walk-ast.scm"))
   (unit pattern-vars
     (source-filename "pattern-vars.scm")    
     (require walk-ast))
   (unit instance-manager
     (source-filename "instance-manager.scm"))
   (unit signature
     (source-filename "signature.scm"))
   (unit type-utils
     (source-filename "type-utils.scm"))
   (unit annotation-utils
     (source-filename "annotation-utils.scm"))
   )