It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) esp-hal-smartled version
950 1 esp32c3-hal dev ^0.8.0
900 3 esp32-hal dev ^0.8.0
700 esp32s3-hal dev ^0.8.0
550 esp32s2-hal dev ^0.8.0
500 esp32c6-hal dev ^0.8.0
160 esp32h2-hal dev ^0.8.0