Slow compilation of chained applyDynamic

[prolativ]

Compiler version

3.2.1 and before

Minimized code

import scala.language.dynamics

object Foo extends Dynamic {
  def applyDynamic(name: String)(): Foo.type = this
}

object Test {
  def test() = {
    Foo
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
      .xxx()
  }
}

Output

This compiles successfully but the compilation time starts to rapidly grow (nonlinearly?) starting from some number of chained invocations desugared to applyDynamic. This happens also for applyDynamicNamed.

Expectation

In scala 2.13 this compiles almost instantly so compilation times should not explode in scala 3 either