diff --git a/compiler/__tests__/parser.test.ts b/compiler/__tests__/parser.test.ts
index c3985ac..8f2196c 100644
--- a/compiler/__tests__/parser.test.ts
+++ b/compiler/__tests__/parser.test.ts
@@ -884,4 +884,37 @@ speck Second {
       }
     });
   });
+
+  // Cycle 73: List<T> fields in interface records must be preserved in the AST.
+  // Previously the generator emitted empty type for these fields because
+  // it called speckTypeToProto(f.type.name) which returns '' when .name is
+  // undefined (List/Map/Set nodes use .elementType/.keyType/.valueType,
+  // not .name). The generator was fixed, but this test locks in the parser
+  // behavior so a regression is caught early.
+  describe('List<T> in interface record fields (cycle 73)', () => {
+    it('should parse List<T> fields in interface records', () => {
+      const content = `speck One {
+  interface Container {
+    items: List<Ticket>,
+    names: List<String>
+  }
+  interface Ticket {
+    id: String
+  }
+}`;
+      const ast = parseSpeckContent(content);
+      const iface = ast.specks[0].members.find(m => m.name === 'Container');
+      expect(iface).toBeDefined();
+      if (iface?.type === 'interface') {
+        expect(iface.fields).toBeDefined();
+        expect(iface.fields.length).toBe(2);
+        expect(iface.fields[0].name).toBe('items');
+        expect(iface.fields[0].type.type).toBe('list');
+        expect(iface.fields[0].type.elementType?.name).toBe('Ticket');
+        expect(iface.fields[1].name).toBe('names');
+        expect(iface.fields[1].type.type).toBe('list');
+        expect(iface.fields[1].type.elementType?.name).toBe('String');
+      }
+    });
+  });
 });