JUnit 6.1.3, compiling OldApis.java
src/compat/OldApis.java:8: error: cannot find symbol
@TestMethodOrder(MethodOrderer.Alphanumeric.class)
                              ^
  symbol:   class Alphanumeric
  location: interface MethodOrderer
src/compat/OldApis.java:13: error: cannot find symbol
        Object loaded = ReflectionSupport.loadClass("java.lang.String");
                                         ^
  symbol:   method loadClass(String)
  location: class ReflectionSupport
src/compat/OldApis.java:14: error: cannot find symbol
        String property = TempDir.SCOPE_PROPERTY_NAME;
                                 ^
  symbol:   variable SCOPE_PROPERTY_NAME
  location: @interface TempDir
3 errors
javac exit status: 1