diff --git a/src/main/php/lang/ast/syntax/PHP.class.php b/src/main/php/lang/ast/syntax/PHP.class.php
index cc669de..0250e79 100755
--- a/src/main/php/lang/ast/syntax/PHP.class.php
+++ b/src/main/php/lang/ast/syntax/PHP.class.php
@@ -1124,6 +1124,7 @@ private function properties($parse, &$body, $meta, $modifiers, $type, $holder) {
 
   /** Parses Hacklang-style annotations (<<test>>) */
   private function annotations($parse, $context) {
+    $parse->warn('Deprecated Hacklang-style annotations used');
     $annotations= [];
     do {
       $name= $parse->token->value;
diff --git a/src/test/php/lang/ast/unittest/parse/HackAnnotationsTest.class.php b/src/test/php/lang/ast/unittest/parse/HackAnnotationsTest.class.php
index ac653ec..032b9fe 100755
--- a/src/test/php/lang/ast/unittest/parse/HackAnnotationsTest.class.php
+++ b/src/test/php/lang/ast/unittest/parse/HackAnnotationsTest.class.php
@@ -3,6 +3,11 @@
 use lang\ast\nodes\{Annotated, Literal, ArrayLiteral};
 use unittest\Assert;
 
+/**
+ * Tests `<<...>>` style annotations
+ *
+ * @deprecated
+ */
 class HackAnnotationsTest extends ParseTest {
 
   /**
@@ -15,6 +20,7 @@ class HackAnnotationsTest extends ParseTest {
    */
   private function assertAnnotations($expected, $code) {
     $children= $this->parse($code)->tree()->children();
+    \xp::gc();
     Assert::equals($expected, cast($children[sizeof($children) - 1], Annotated::class)->annotations);
   }