PropCheck.produce

You're seeing just the function produce, go back to PropCheck module for more information.
Link to this function

produce(gen, size \\ 10, seed \\ :os.timestamp())

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Sample values from a generator gen.

Example

iex> use PropCheck
iex> produce(1)
{:ok, 1}
iex> nat() |> produce() |> Kernel.elem(1) |> is_integer()
true
iex> nat() |> list() |> produce() |> Kernel.elem(1) |> is_list()
true