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

Depender (with downloads and own rev deps) DebuggerTest version
19.0M 1803 smallvec dev ^0.1.0
10.9M 159 tinyvec dev ^0.1
1.9M 209 widestring dev ^0.1
supply-chain-trust-example-crate-000085 dev ^0.1
supply-chain-trust-example-crate-000090 dev ^0.1