anchor.diff:  
   (define-sw-parser-rule :AUX-MATCH ()
     (:anyof
  -   ((:tuple (1 :NON-MATCH-BRANCH) "|" (2 :AUX-MATCH)) (cons 1 2))
  -   ((:tuple (1 :BRANCH))                              (cons 1 nil))
  +   ((:tuple (1 :NON-BRANCH-BRANCH) "|" (2 :AUX-MATCH)) (cons 1 2))
  +   ((:tuple (1 :BRANCH))                               (cons 1 nil))
      ))
  -
  -(define-sw-parser-rule :NON-MATCH-BRANCH ()
  -  (:tuple (1 :PATTERN) "->" (2 :NON-MATCH-EXPRESSION))
  -  (make-branch 1 2 ':left-lc ':right-lc))
   
   (define-sw-parser-rule :BRANCH ()
     (:tuple (1 :PATTERN) "->" (2 :EXPRESSION))
  +  (make-branch 1 2 ':left-lc ':right-lc))
  +
  +(define-sw-parser-rule :NON-BRANCH-BRANCH () ; as above, but not ending with "| .. -> .."
  +  ;; i.e., a branch that doesn't end in a branch
  +  (:tuple (1 :PATTERN) "->" (2 :NON-BRANCH-EXPRESSION))
     (make-branch 1 2 ':left-lc ':right-lc))
   
   ;;; ========================================================================
  
positive.code:   (:tuple "if" (1 :EXPRESSION) "then" (2 :EXPRESSION) "else" (3 :EXPRESSION))
    (make-if-expression 1 2 3 ':left-lc ':right-lc)  :documentation "If-Then-Else")
  
  (define-sw-parser-rule :NON-MATCH-IF-EXPRESSION ()
    (:tuple "if" (1 :EXPRESSION) "then" (2 :EXPRESSION) "else" (3 :NON-MATCH-EXPRESSION))
    (make-if-expression 1 2 3 ':left-lc ':right-lc)  :documentation "If-Then-Else")
  
  ;;; ------------------------------------------------------------------------
  
negative.code:    ((:tuple "let" (1 :REC-LET-BINDING-SEQUENCE) "in" (2 :EXPRESSION)) (make-rec-let-binding-term 1 2 ':left-lc ':right-lc) :documentation "RecLet Binding")
     ))
  
  (define-sw-parser-rule :NON-BRANCH-LET-EXPRESSION () ; as above, but not ending with "| .. -> .."
    (:anyof
     ((:tuple "let" (1 :RECLESS-LET-BINDING)      "in" (2 :NON-BRANCH-EXPRESSION)) (make-let-binding-term     1 2 ':left-lc ':right-lc) :documentation "Let Binding")
     ((:tuple "let" (1 :REC-LET-BINDING-SEQUENCE) "in" (2 :NON-BRANCH-EXPRESSION)) (make-rec-let-binding-term 1 2 ':left-lc ':right-lc) :documentation "RecLet Binding")
     ))
  
  (define-sw-parser-rule :RECLESS-LET-BINDING ()
  