New modularity language import

[Cherry-picked 34f17b7]

Author: odersky

library/src/scala/runtime/stdLibPatches/language.scala

@@ -96,7 +96,18 @@ object language:
      *  @see [[https://dotty.epfl.ch/docs/reference/experimental/into-modifier]]
      */
     @compileTimeOnly("`namedTuples` can only be used at compile time in import statements")
-    object namedTuples
+    object namedTupleas
+
+    /** Experimental support for new features for better modularity, including
+     *   - better tracking of dependencies through classes
+     *   - better usability of context bounds
+     *   - better syntax and conventions for type classes
+     *   - ability to merge exported types in intersections
+     *
+     *  @see [[https://dotty.epfl.ch/docs/reference/experimental/modularity]]
+     */
+    @compileTimeOnly("`modularity` can only be used at compile time in import statements")
+    object modularity
 
     /** Was needed to add support for relaxed imports of extension methods.
       * The language import is no longer needed as this is now a standard feature since SIP was accepted.