src/v8/test/mjsunit/keyed-array-call.js

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var a = [function(a) { return a+10; },
         function(a) { return a+20; }];
a.__proto__.test = function(a) { return a+30; }
function f(i) {
  return "r" + (1, a[i](i+1), a[i](i+2));
}

assertEquals("r12", f(0));
assertEquals("r12", f(0));
assertEquals("r23", f(1));
assertEquals("r23", f(1));

// Deopt the stub.
assertEquals("rtest230", f("test"));

var a2 = [function(a) { return a+10; },,
          function(a) { return a+20; }];
a2.__proto__.test = function(a) { return a+30; }
function f2(i) {
  return "r" + (1, a2[i](i+1), a2[i](i+2));
}

assertEquals("r12", f2(0));
assertEquals("r12", f2(0));
assertEquals("r24", f2(2));
assertEquals("r24", f2(2));

// Deopt the stub. This will throw given that undefined is not a function.
assertThrows(function() { f2(1) });