Function ucl_array_pop_first 

pub unsafe extern "C" fn ucl_array_pop_first(
    top: *mut ucl_object_t,
) -> *mut ucl_object_t

Removes the first element from the array top, returning the object that was removed. This object is not released, caller must unref the returned object when it is no longer needed. @param top array ucl object @return removed element or NULL if top is NULL or not an array