Am I the only one who thinks that nested multi-line comments should be universally supported across all modern languages? It's not that much harder to parse, and it doesn't happen often but I remember specifically wishing for this language feature in the past.
And while we're at it, I think nested HTML anchor elements should be supported too.
It's quite enlightening to learn how Java matures over time. I remember when
Cloneablewas initially promoted as the new cool thing, but now pretty much everybody agree it's a broken mess.