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lib/tests/modules/merge-module-with-key.nix

@@ -0,0 +1,49 @@
+{ lib, ... }:
+let
+  inherit (lib) mkOption types;
+
+  moduleWithoutKey = {
+    config = {
+      raw = "pear";
+    };
+  };
+
+  moduleWithKey = {
+    key = __curPos.file + "#moduleWithKey";
+    config = {
+      raw = "pear";
+    };
+  };
+
+  decl = {
+    options = {
+      raw = mkOption {
+        type = types.lines;
+      };
+    };
+  };
+in
+{
+  options = {
+    once = mkOption {
+      type = types.submodule {
+        imports = [
+          decl
+          moduleWithKey
+          moduleWithKey
+        ];
+      };
+      default = { };
+    };
+    twice = mkOption {
+      type = types.submodule {
+        imports = [
+          decl
+          moduleWithoutKey
+          moduleWithoutKey
+        ];
+      };
+      default = { };
+    };
+  };
+}