anchor.diff:  
   (test-ps-js switch-return-fallthrough
     (defun foo ()
  -    (return-from foo
  -      (switch x
  -        (1 (foo) break)
  -        (2 (bar))
  -        (default 4))))
  +    (switch x
  +      (1 (foo) break)
  +      (2 (bar))
  +      (default 4)))
     "function foo() {
       switch (x) {
       case 1:
  
positive.code: 
  (test-ps-js return-case-break-elimination
    (defun foo ()
      (return-from foo
        (case 1
          (0 1)
          (otherwise 2))))
    "function foo() {
      switch (1) {
      case 0:
  
negative.code: 
  (test-ps-js return-last-case
    (defun foo ()
      (case x
        (:a 'eh)
        (:b 'bee)))
    "function foo() {
      switch (x) {
      case 'a':
  