code: public ConfigParseOptions setClassLoader(ClassLoader loader) {
          if (this.classLoader == loader)
              return this;
          else
              return new ConfigParseOptions(this.syntax, this.originDescription, this.allowMissing,
                      this.includer, loader);
      }
docs: Set the class loader. If set to null,
  <code>Thread.currentThread().getContextClassLoader()</code> will be used.
  
  @param loader
  a class loader or {@code null} to use thread context class
  loader
  @return options with the class loader set