Test record declarations.

Author: robrix

languages/tree-sitter-stack-graphs-java/test/decl/record.java

@@ -0,0 +1,8 @@
+record A(int x, int y) {
+    A a;
+  //^ defined: 1
+}
+class B {
+    B b;
+  //^ defined: 1
+}