v8/test/mjsunit/regress/regress-crbug-245424.js

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// Flags: --allow-natives-syntax

function boom() {
  var a = {foo: 'bar', foo: 'baz'};

  return a;
};
%PrepareFunctionForOptimization(boom);
assertEquals("baz", boom().foo);
assertEquals("baz", boom().foo);
%OptimizeFunctionOnNextCall(boom);
assertEquals("baz", boom().foo);