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let drv0 = derivation { name = "fail"; builder = "/bin/false"; system = "x86_64-linux"; outputs = [ "out" "foo" ]; }; drv1 = derivation { name = "fail-2"; builder = "/bin/false"; system = "x86_64-linux"; outputs = [ "out" "foo" ]; }; combo-path = "${drv0.drvPath}${drv1.drvPath}"; in builtins.addDrvOutputDependencies combo-path