v8/test/mjsunit/regress/internalized-string-not-equal.js

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// Flags: --allow-natives-syntax

// A bug in r15773, when masks for internalized string and string types
// were reorganized.
function equal(o1, o2) {
  return o1 == o2;
};
%PrepareFunctionForOptimization(equal);
var a = 'abc';
var b = "abc";
equal(a, b);
equal(a, b);
%OptimizeFunctionOnNextCall(equal);
assertTrue(equal(1.3, 1.3));