This feature is available under -preview since Scala 3.10.0. It is specified in SIP-68.

One limitation with package objects is that we cannot currently assign them to values: a.b fails to compile when b is a package object, even though it succeeds when b is a normal object. The workaround is to call

  a.b.`package`

But this is ugly and non-obvious. Or one could use a normal object, which is not always possible.

This preview feature drops that limitation. It is enabled by the -preview compiler flag.

The feature turns the following into valid code:

package a
package object b

val z = a.b

Without the feature, the workaround is to use a .package suffix:

val z = a.b.`package`

With the feature, a reference such as a.b where b is a package containing a package object, expands to a.b.package automatically.