It's used only as a dev dependency in 4 crates.

Depender (with downloads and own rev deps) dwt-systick-monotonic version
5.8K 44 stm32f4xx-hal dev ^1.1
3.5K 1 atsame54_xpro dev ^1.1
240 epd-spectra dev ^1.1.0
n32g4xx-hal dev ^1.1