anchor.diff:  
   (test-ps-js return-last-case
     (defun foo ()
  -    (return-from foo
  -      (case x
  -       (:a 'eh)
  -       (:b 'bee))))
  +    (case x
  +      (:a 'eh)
  +      (:b 'bee)))
     "function foo() {
       switch (x) {
       case 'a':
  
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-macrolet
    (defun foo ()
      (macrolet ((x () 1))
        (case (x)
          (:a 'eh)
          (:b 'bee))))
    "function foo() {
      switch (1) {
      case 'a':
  