default_env is used at run time in 9 crates (of which 2 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) default_env version
pq ^0.1.1
2 squads-mpl ^0.1.1
1 mantle ^0.1
1 fontpm-source-google-fonts ^0.1.1