1 1
   2 2
   3 0
   4 1
   5 2
   6 0
   7 SyntaxError: test/script/basic/es6/let-const-switch.js#34:8<eval>:1:25 Unsupported let declaration in unprotected switch statement
   8 switch (x) { case 0: let x = 1; }
   9                          ^
  10 SyntaxError: test/script/basic/es6/let-const-switch.js#34:8<eval>:1:27 Unsupported const declaration in unprotected switch statement
  11 switch (x) { case 0: const x = 1; }
  12                            ^