It's used only as a dev dependency in 12 crates.

Depender (with downloads and own rev deps) smol-macros version
453K 302 smol dev ^0.1.0
18K 15 rustls-acme dev ^0.1.0
650 viz-smol dev ^0.1
480 cast-sender dev ^0.1
420 pdf2pwg dev ^0.1
230 1 unicom-nres dev ^0.1
200 unicom-tcp dev ^0.1
140 iocraft dev ^0.1.1
crossmist dev ^0.1
async-nng dev ^0.1
smol-axum dev ^0.1.0
vuot dev ^0.1