I successfully built all reverse dependencies, using this procedure[1]:
$ nix-env -f . -qaP \* --drv-path | sort > l1
(...modify package...)
$ nix-env -f . -qaP \* --drv-path | sort > l2
$ changed=$(diff l1 l2 | awk '{print $2}' | sort | uniq)
$ nix-build $(for i in $changed; do echo -A $i; done)
[1]: https://nixos.org/wiki/Contributing
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