ScalaDoc shows wrong type for this.type

[odersky]

Compiler version

3.2.1 RC-1

Minimized example

In Tuple.scala:

  inline def map[F[_]](f: [t] => t => F[t]): Map[this.type, F] =
    runtime.Tuples.map(this, f).asInstanceOf[Map[this.type, F]]

Output

Scaladoc output:

def map[F[_]](f: [t] => (x$1: t) => F[t]): Map[Tuple, F]

Expectation

this.type should be rendered as this.type, not Tuple. The two have very different meanings. I am not sure whether other singleton types are rendered correctly, we should check that as well.

[som-snytt]

This rings a bell #15426 which is deemed fixed in June. Nightly docs shows that was fixed but not this report.