v8/test/mjsunit/keyed-load-with-symbol-key.js

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// Flags: --allow-natives-syntax --opt --no-always-opt

var s = Symbol("foo");

var o = {
  [s]: "bar",
}

function get(obj, key) {
  return obj[key];
}

%PrepareFunctionForOptimization(get);
assertEquals("bar", get(o, s));
get(o, s);
get(o, s);

%OptimizeFunctionOnNextCall(get);
assertEquals("bar", get(o, s));

assertOptimized(get);

get(o, "funny");
assertUnoptimized(get);