Object Equality examples in "Programming in Scala 5th edition" by Odersky, Spoon, Venners, Sommers

[spamegg1]

I have Scala 3.1 that I got from Homebrew: brew install lampepfl/brew/dotty and OpenJDK 11:

 ➜ scala --version
Scala code runner version 3.1.0 -- Copyright 2002-2021, LAMP/EPFL
 ➜ java --version
openjdk 11.0.11 2021-04-20
OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.20.04)
OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed mode, sharing)

I have the June 14, 2021 version of the book. On Page 123, Section 5.8 it says

Going further, you can compare two objects that have different types:

1 == 1.0 // true: Boolean
List(1, 2, 3) == "hello" // false: Boolean

However my REPL says:

 ➜ scala
Welcome to Scala 3.1.0 (11.0.11, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                              
scala> List(1,2,3) == "hello"
-- Error:
1 |List(1,2,3) == "hello"
  |^^^^^^^^^^^^^^^^^^^^^^
  |Values of types List[Int] and String cannot be compared with == or !=

This is not a compiler/REPL bug, right? This looks in line with Multiversal Equality

So, the book must be in error? Or maybe things changed from 3.0 to 3.1? I submitted to Errata but just wanted to double-check.

[odersky]

That looks indeed like an error in the book. Can you send an erratum to Bill Venners? Thanks!

[spamegg1]

Done, thanks for the quick response Martin!