cpp_syn is used at run time in 10 crates. It is a direct run-time dependency in 4 crates.

Depender (with downloads and own rev deps) cpp_syn version
110 2 cpp_synmap ^0.12
1 embed_js_derive ^0.12.0
embed_js_build ^0.12.0
2 embed_js_common ^0.12.0