src/java.base/share/classes/java/nio/file/FileSystems.java

*** 143,152 ****
--- 143,161 ----
              return provider;
          }
      }
  
      /**
+      * Returns the builtin {@code FileSystem}.
+      *
+      * @return the builtin file system
+      */
+     static FileSystem getBuiltin() {
+         return BuiltinFileSystemHolder.builtinFileSystem;
+     }
+ 
+     /**
       * Returns the default {@code FileSystem}. The default file system creates
       * objects that provide access to the file systems accessible to the Java
       * virtual machine. The <em>working directory</em> of the file system is
       * the current user directory, named by the system property {@code user.dir}.
       * This allows for interoperability with the {@link java.io.File java.io.File}