Scaladoc readTasty error with overloads + union parameters

[katrinafyi]

Compiler version

tested on 3.7.1 and 3.3.4

Minimized code

// remark 6: using an enum instead -> no error
sealed trait E
case object A extends E
case object B extends E
case object C extends E

class Main {
  // remark 1: distinguishing these by @targetName -> no error
  // remark 2: different return types -> still errors
  // remark 3: placing these methods inside an object rather than a class -> no error
  // remark 4: removing an overload -> no error
  // remark 5: removing B.type from the union  -> no error
  def parse(kind: A.type | B.type): Int = 1
  def parse(kind: C.type): Int = 2
}

object Main {
  @main def hello(): Unit =
    val m = Main()
    // remark 7: m.parse(C) -> no error
    // remark 8: m.parse(B) -> still errors
    println(m.parse(A))
}

This can be pasted into a new sbt project (sbt new scala/scala3.g8), then run sbt doc to observe the scaladoc crash (next section).

Also, observe that the code does compile and run without error.

Output

The scaladoc generator reports a fatal error. I can't tell if this error originates from Scaladoc, or if it's caused by an incorrect tasty file.

[info] Main Scala API documentation to /home/x/Downloads/scaladoc-bug/scaladoc-bug/target/scala-3.7.1/api...
[warn] Flag -classpath set repeatedly
[error] -- Error: src/main/scala/Main.scala:20:12 --------------------------------------
[error] 20 |    println(m.parse(A))
[error]    |            ^^^^^^^^^
[error]    |undefined: m.parse # -1: TermRef(TermRef(NoPrefix,val m),parse) at readTasty
[warn] one warning found
[error] one error found
[error] (Compile / doc) DottyDoc Compilation Failed

Expectation

The scaladoc generator should succeed on this valid scala source code.