[erlang-questions] What's this mean:[1|1]?It's it a bug?

饕餮 249505968@REDACTED
Wed Jul 3 12:03:07 CEST 2013

One of my new teammate found that this expression can work like list:nth(1,[1|1]) is legal.And the is_list([1|1]) is true
so what's this expression mean or it's just like some bug?
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