https://github.com/NixOS/nixpkgs/tree/master/pkgs/by-name/dm/dmenu-rs is not a drop in replacement for dmenu because of this issue Shizcow/dmenu-rs#5 (The proposed change wasn't actually brought to the master branch). Perhaps a solution would be to rename the binary to dmenu_rs and dmenu_rs_run
https://github.com/NixOS/nixpkgs/tree/master/pkgs/by-name/dm/dmenu-rs is not a drop in replacement for dmenu because of this issue Shizcow/dmenu-rs#5 (The proposed change wasn't actually brought to the master branch). Perhaps a solution would be to rename the binary to dmenu_rs and dmenu_rs_run