never-say-never is used at run time in 54 crates (of which 3 optionally). It is a direct run-time dependency in 7 crates.

Depender (with downloads and own rev deps) never-say-never version
125K 10 polonius-the-crab ^6.6.666
64K 7 lending-iterator ^6.6.666
59K 6 higher-kinded-types ^6.6.666
7.2K dittolive-ditto ^6.6.666
440 direct-share ^6.6.666
ghosts ^6.6.666
const-dispatch ^6.6.666