alef 0.79.4

Opinionated polyglot binding generator for Rust libraries
Documentation 
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	handle := {{ start_call }}
	if handle == 0 {
		if err := lastError(); err != nil {
			return nil, err
		}
		return nil, fmt.Errorf("failed to start {{ method_name }} stream")
	}
	ch := make(chan {{ item_type }})
	go func() {
		defer close(ch)
		defer C.{{ fn_free }}(handle)
		for {
			chunkPtr := C.{{ fn_next }}(handle)
			if chunkPtr == 0 {
				// Null = clean end-of-stream (errno 0) or stream error (errno != 0).
				// In either case there are no more chunks; close the channel.
				return
			}
			jsonPtr := C.{{ item_to_json_fn }}(chunkPtr)
			if jsonPtr == nil {
				C.{{ item_free_fn }}(chunkPtr)
				return
			}
{% if item_is_sum_type %}
			chunk, unmarshalErr := Unmarshal{{ item_type }}([]byte(C.GoString(jsonPtr)))
{% else %}
			var chunk {{ item_type }}
			unmarshalErr := json.Unmarshal([]byte(C.GoString(jsonPtr)), &chunk)
{% endif %}
			C.{{ free_string_fn }}(jsonPtr)
			C.{{ item_free_fn }}(chunkPtr)
			if unmarshalErr != nil {
				return
			}
			ch <- chunk
		}
	}()
	return ch, nil
}