It's used only as a dev dependency in 5 crates.

Depender (with downloads and own rev deps) embedded-alloc version
9.6K 49 rp2040-hal dev ^0.5.1
dht-pio dev ^0.5.0
ch58x-hal dev ^0.5.0
rx8900 dev ^0.5.1
aht10-embedded dev ^0.5.0