EitherN is used at run time in 36 crates (of which 4 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) EitherN version
500 7 syn-helpers ^0.2
350 1 enum-variants-strings-derive ^0.2
120 1 derive-finite-automaton-derive ^0.2
1 domafic optional ^0.2.0