PropCheck.BasicTypes.fixed_list

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

fixed_list(list_of_types)

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Specs

fixed_list([raw_type()]) :: type()

All lists whose i-th element is an instance of the type at index i of list_of_types. Also written simply as a list of types.