Bottle.List.is_non_empty_list

You're seeing just the macro is_non_empty_list, go back to Bottle.List module for more information.
Link to this macro

is_non_empty_list(sub)

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Guard that passes for a non empty list

Examples

iex> is_non_empty_list([:foo])
true

iex> is_non_empty_list([])
false