langtools/tools/javac/T8152616.java is missing @modules to declare the non-exported packages that the test makes use of. This is problem when the test is run with --illegal-access=deny, it only works now because these packages are opened for illegal access. The test should be updated to use @modules:

diff --git a/test/langtools/tools/javac/T8152616.java b/test/langtools/tools/javac/T8152616.java
--- a/test/langtools/tools/javac/T8152616.java
+++ b/test/langtools/tools/javac/T8152616.java
@@ -25,7 +25,8 @@
  * @test
  * @bug 8152616
  * @summary Unit test for corner case of PrettyPrinting when SourceOutput is false
- * @run compile --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED T8152616.java
+ * @modules jdk.compiler/com.sun.tools.javac.api
+ jdk.compiler/com.sun.tools.javac.tree
  * @run main T8152616
  */