## Symptom
```
/home/sonia/fool/openjdk/jdk/test/langtools/tools/lib/toolbox/JavacTask.java:46: error: package com.sun.tools.javac.api is not visible
import com.sun.tools.javac.api.JavacTaskImpl;
                          ^
  (package com.sun.tools.javac.api is declared in module jdk.compiler, which does not export it to the unnamed module)
/home/sonia/fool/openjdk/jdk/test/langtools/tools/lib/toolbox/JavacTask.java:47: error: package com.sun.tools.javac.api is not visible
import com.sun.tools.javac.api.JavacTool;
                          ^
  (package com.sun.tools.javac.api is declared in module jdk.compiler, which does not export it to the unnamed module)
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors

TEST RESULT: Failed. Compilation failed: Compilation failed
```

## Fix
```
diff -r 355f4f42dda5 test/langtools/tools/javac/api/TestModuleUnnamedPackage.java
--- a/test/langtools/tools/javac/api/TestModuleUnnamedPackage.java Thu Nov 14 10:55:46 2019 +0100
+++ b/test/langtools/tools/javac/api/TestModuleUnnamedPackage.java Thu Nov 14 22:43:17 2019 +0800
@@ -25,7 +25,7 @@
  * @test
  * @bug 8234025
  * @summary Elements.getPackageElement(ModuleElement,CharSequence) returns null for unnamed package
- * @modules jdk.compiler
+ * @modules jdk.compiler/com.sun.tools.javac.api jdk.compiler/com.sun.tools.javac.main
  * @library /tools/lib /tools/javac/lib
  * @build toolbox.ModuleBuilder toolbox.ToolBox
  * @run main TestModuleUnnamedPackage
```