code: public void visitRequire(String module, int access, String version) {
          if (mv != null) {
              mv.visitRequire(module, access, version);
          }
      }
docs: Visits a dependence of the current module.
  
  @param module the qualified name of the dependence.
  @param access the access flag of the dependence among
  ACC_TRANSITIVE, ACC_STATIC_PHASE, ACC_SYNTHETIC
  and ACC_MANDATED.
  @param version the module version at compile time or null.