Debug build failure with KeyedBroadcastProcessFunction

[eikel]

For testing purposes, I added a new example 11 to this branch which is a copy of a working example from the original repository (see first commit). I added a new class MyFunction that extends KeyedBroadcastProcessFunction (see second commit). This builds without problems with Scala 3.0.2 (used in the original repository). I then tried to update the Scala version (first to 3.1.0, then to 3.1.3; see commits three and four) and with both the compilation breaks with:

[error] -- Error: …/flink-scala-3/src/main/scala/com/ververica/Example_11_KeyedBroadcastProcessFunction.scala:65:6 
[error] 65 |class MyFunction
[error]    |      ^
[error]    |bridge generated for member object ReadOnlyContextKeyedBroadcastProcessFunction.this.ReadOnlyContext in class KeyedBroadcastProcessFunction
[error]    |which overrides object ReadOnlyContextBaseBroadcastProcessFunction.this.ReadOnlyContext in class BaseBroadcastProcessFunction
[error]    |clashes with definition of the member itself; both have erased type KeyedBroadcastProcessFunction.this.ReadOnlyContext."
[error] one error found
[error] (Compile / compileIncremental) Compilation failed

I see no way to fix this in the code extending KeyedBroadcastProcessFunction. Does this have to be fixed in the Flink upstream code? Or is this a bug in the Scala compiler (e.g., scala/bug#8702, scala/bug#10082)?

[eikel]

@sjwiesman As you have created the original Flink + Scala 3 examples, maybe you have an idea what might be the reason for this build failure?

[eikel]

Still the same error with Scala 3.2.0.

[eikel]

Updating to Scala 3.2.1 fixes the issue. It seems to be the same as scala/scala3#15199.