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-macrolet
    (defun foo ()
      (return-from foo
        (macrolet ((x () 1))
          (case (x)
            (:a 'eh)
            (:b 'bee)))))
    "function foo() {
      switch (1) {
      case 'a':
  
negative.code: 
  (test-ps-js switch-return-fallthrough
    (defun foo ()
      (switch x
        (1 (foo) break)
        (2 (bar))
        (default 4)))
    "function foo() {
      switch (x) {
      case 1:
  