Description:
------------
We tried upgrading from php 7.0.4 to 7.0.5. Unfortunately zendframework stopped working. After debugging I came up with a reduced testcase that reproduces the issue.

On php 7.0.4 it outputs the expected result, on 7.0.5 the wrong result. 

This only happens if the switch-case is in there, if i replace it with if/else it works.



Test script:
---------------
<?php
$tokenIndex = 0;
$tokens = [T_WHITESPACE, T_CLASS];
$tokenType = null;

$MACRO_TOKEN_ADVANCE = function () use (&$tokenType, &$tokenIndex, $tokens) {
  if (!isset($tokens[$tokenIndex])) return false;
  $tokenType = $tokens[$tokenIndex++];

  return $tokenType;
};
$MACRO_TOKEN_ADVANCE();

SCANNER_TOP:
switch($tokenType) {
  case T_WHITESPACE: echo "whitespace"; break;
  case T_CLASS: echo "class"; break;
}

if ($MACRO_TOKEN_ADVANCE() !== false) goto SCANNER_TOP;

Expected result:
----------------
whitespaceclass

Actual result:
--------------
whitespacewhitespace