Inlined method with return type "this.type" is ignored, when called several times

[edolgy]

Compiler version

3.0.0

Minimized code

object Test:

  class Foo:
    var buf = ""

    def add(v: String): Unit = buf += v

    @scala.annotation.targetName("addOp") inline def += (inline v: String): this.type = {add(v); this }


  def main(sa: Array[String]): Unit =

    var fooVar = new Foo
    fooVar += "a" += "b" += "c"
    println(fooVar.buf)              // Prints: abc

    val fooVal = new Foo
    fooVal += "a" += "b" += "c"
    println(fooVal.buf)              // Prints: c     // Expected abc

Problem

If inlined method "+=" return type changed from "this.type" to Foo, the problem goes away.