About the initial lack of support for the new given syntax in IntelliJ, I got a nice message from the plugin team at JetBrains about this, on their Discord. They acknowledged that the usual intent is for the plugin to be ready at release time; that it didn’t fully happen this time; and they’ll try to prevent that from recurring in the future. “That includes both improving testing on our side and the coordination process between the teams working on Scala” The Scala 3 team is also aware and will try to help to prevent it from recurring.