v8/test/mjsunit/harmony/block-lazy-compile.js

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// Flags: --allow-natives-syntax
// Test deserialization of block contexts during lazy compilation
// of closures.

function f() {
  var g;
  {
    // TODO(keuchel): introduce let
    var x = 0;
    g = function () {
      x = x + 1;
      return x;
    }
  }
  return g;
}

var o = f();
%PrepareFunctionForOptimization(o);
assertEquals(1, o());
assertEquals(2, o());
assertEquals(3, o());
%OptimizeFunctionOnNextCall(o);
assertEquals(4, o());