syn_derive is used at run time in 1,801 crates (of which 169 optionally). It is a direct run-time dependency in 8 crates. It's used only as a dev dependency in 44 crates.

Depender (with downloads and own rev deps) syn_derive version
5.5M 52 borsh-derive ^0.1.6
49K 19 rstml ^0.1.6
650 1 sumtype-macro ^0.1.8
650 forward-traits ^0.1
200 1 odra-macros ^0.1.8
rstml-control-flow ^0.1.6
1 chandeliers-syn ^0.1.7
230 1 html-node-macro optional ^0.1