v8/test/mjsunit/compiler/optimized-closures.js

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// Flags: --allow-natives-syntax

// Test optimized closures.

var a = new Array(100);

function f() {
  var x=0;
  for (var i=0; i<100; i++) {
    var g = function goo(y) {
      function h() {
        if (goo.arguments[0] == 23) return -42;
        return 42;
      }
      return x + y + h(y);
    };
    %PrepareFunctionForOptimization(g);
    g(0);
    %OptimizeFunctionOnNextCall(g);
    a[i] = g(i);
  }
}

f();
assertEquals(42, a[0]);
assertEquals(49, a[7]);
assertEquals(-19, a[23]);