noop_proc_macro is used at run time in 29 crates (of which 14 optionally, 4 directly).

Depender (with downloads and own rev deps) noop_proc_macro version
13K 4 v_frame ^0.3.0
10K 4 rav1e ^0.3.0
2.7K cardano-serialization-lib ^0.3.0
310 6 cardano-multiplatform-lib ^0.3.0