Missing error on synchronized from value class

[som-snytt]

Compiler version

Scala compiler version 3.3.1-RC1-bin-SNAPSHOT-git-4cb6ee6

Minimized code

class A(val s: String) extends AnyVal {
  //def f = eq("hello, world")  // missing argument list for method eq in object Predef

  def g = synchronized { println("hello, world") }
}

Output

g does not compile in Scala 2, but in Scala 3 is accepted, as though written A.synchronized.

The error on f is charming. I was expecting it to use (Predef: AnyRef).eq and was hoping for a warning.

Expectation

Error on synchronized. Warnings for accidental selections from Predef, as for top-level defs.

[mbovel]

Related previous PRs: #17449 #18021.

[mbovel]

This issue was picked for the Scala Issue Spree of April 30th. @EugeneFlesselle, @mbovel and @nox213 will be working on it. If you have any insight into the issue or guidance on how to fix it, please leave it here.