A DESCRIPTION OF THE PROBLEM :
visitModuleImport in com.sun.tools.javac.tree.TreeScanner has not been overriden, so defaulted to Visitor::visitModuleImport, which forwards to Visitor::visitTree, which is also not overriden, and, therefore, threw AssertionError.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile code with module import in it

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
normal compilation
ACTUAL -
internal compiler error (AssertionError is thrown)

---------- BEGIN SOURCE ----------
package io.avaje.modules.example;

import module java.base;

import java.util.List;

public class Main {

  public static void main(String[] args) {

    List.of();

  }
}
---------- END SOURCE ----------

FREQUENCY : always