Comment #3 on issue 4317 by [email protected]: @@isConcatSpreadable is ignored by Array.prototype.concat when the arguments are arrays
https://code.google.com/p/v8/issues/detail?id=4317

Actually, this really does seem like a bug. I am getting the output given by the reporter when I pass the --harmony_concat_spreadable flag. And with the definition posted by Cait, b should not be spreadable, so it should show up in the output.

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