due to the fact that the presence of module-info.java files in source-path automatically makes jtreg to compile source code as a module, it's impossible to use library classes defined in USER_MODULE libraries by the tests which can't/shouldn't change their module graphs. specifically, this makes JDK-8211358 and similar enchantments impossible/impractical.

a possible solution for this is to move module-info.java into a separate location and teach jtreg to look into that location, so a library can be used both USER_MODULE and PACKAGE library.