fix(lns): fall back to canonical catalogs

lns.go

@@ -2435,7 +2435,11 @@ func (s *Service) reservedCatalog() *covenant.ReservedCatalog {
 		return s.reservedCatalogOverride
 	}
 
-	return Reserved
+	if Reserved != nil {
+		return Reserved
+	}
+
+	return covenant.DefaultReservedCatalog()
 }
 
 // lockedCatalog returns the package-backed locked-name catalog.
@@ -2444,7 +2448,11 @@ func (s *Service) lockedCatalog() *covenant.LockedCatalog {
 		return s.lockedCatalogOverride
 	}
 
-	return Locked
+	if Locked != nil {
+		return Locked
+	}
+
+	return covenant.DefaultLockedCatalog()
 }
 
 // GetCore is an alias for Core.
@@ -2729,14 +2737,22 @@ var Locked = covenant.DefaultLockedCatalog()
 //
 //	catalog := lns.ReservedCatalog()
 func ReservedCatalog() *covenant.ReservedCatalog {
-	return Reserved
+	if Reserved != nil {
+		return Reserved
+	}
+
+	return covenant.DefaultReservedCatalog()
 }
 
 // LockedCatalog exposes the locked-name catalog used by the package.
 //
 //	catalog := lns.LockedCatalog()
 func LockedCatalog() *covenant.LockedCatalog {
-	return Locked
+	if Locked != nil {
+		return Locked
+	}
+
+	return covenant.DefaultLockedCatalog()
 }
 
 // ReservedSize reports the number of reserved-name entries available to the package.

lns_package_test.go

@@ -404,6 +404,52 @@ func TestPackageDefaultCatalogsIgnoreOverrides(t *testing.T) {
 	}
 }
 
+func TestPackageCatalogFallbacksWhenNil(t *testing.T) {
+	origReserved := Reserved
+	origLocked := Locked
+	defer func() {
+		Reserved = origReserved
+		Locked = origLocked
+	}()
+
+	Reserved = nil
+	Locked = nil
+
+	if ReservedCatalog() == nil {
+		t.Fatal("ReservedCatalog should fall back to the canonical catalog when nil")
+	}
+
+	if LockedCatalog() == nil {
+		t.Fatal("LockedCatalog should fall back to the canonical catalog when nil")
+	}
+
+	if _, ok := GetReservedName("RESERVED"); !ok {
+		t.Fatal("GetReservedName should keep working when Reserved is nil")
+	}
+
+	if _, ok := GetLockedName("NEC"); !ok {
+		t.Fatal("GetLockedName should keep working when Locked is nil")
+	}
+
+	svc := NewService(nil)
+
+	if svc.ReservedCatalog() == nil {
+		t.Fatal("service ReservedCatalog should fall back to the canonical catalog when nil")
+	}
+
+	if svc.LockedCatalog() == nil {
+		t.Fatal("service LockedCatalog should fall back to the canonical catalog when nil")
+	}
+
+	if _, ok := svc.GetReservedName("RESERVED"); !ok {
+		t.Fatal("service GetReservedName should keep working when Reserved is nil")
+	}
+
+	if _, ok := svc.GetLockedName("NEC"); !ok {
+		t.Fatal("service GetLockedName should keep working when Locked is nil")
+	}
+}
+
 func TestLookupCatalogNamePreservesDottedLabels(t *testing.T) {
 	hash := primitives.Hash(sha3.Sum256([]byte("foo.bar")))