eval/nixpkgs: eval package list once with aliases

ofborg/src/tasks/eval/nixpkgs.rs

@@ -444,6 +444,18 @@ impl<'a> EvaluationStrategy for NixpkgsStrategy<'a> {
                 vec![String::from("--file"), String::from(".")],
                 self.nix.clone(),
             ),
+            EvalChecker::new(
+                "package-list-with-aliases",
+                nix::Operation::QueryPackagesJson,
+                vec![
+                    String::from("--file"),
+                    String::from("."),
+                    String::from("--arg"),
+                    String::from("config"),
+                    String::from("{ allowAliases = true; }"),
+                ],
+                self.nix.clone(),
+            ),
             EvalChecker::new(
                 "lib-tests",
                 nix::Operation::Build,