thiserror-core is used at run time in 23 crates (of which 10 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) thiserror-core version
370 tuit ^1.0
padding-oracle ^1.0
platform-switch optional ^1.0