Yahoo Groups is shutting down: https://help.yahoo.com/kb/groups/SLN31010.html
I used to participate in a few niche Esperanto groups there, a shame to see it go.
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I'm a big fan of segmented stacks (or 'split stacks'), where stack frames are heap allocated, You can write recursive functions with less worry, and you get better tracebacks than TCO.
Go is the most popular language with this feature, to my knowledge: https://dave.cheney.net/2013/06/02/why-is-a-goroutines-stack-infinite
I'd assumed that LLVM didn't support this, but gollvm handles it fine! https://groups.google.com/g/golang-nuts/c/ivOZ-j6Zt2c/m/BUBX2Td9BgAJ
Rich Hickey compares REPL design with RPC style nREPL: https://groups.google.com/g/clojure-dev/c/Dl3Stw5iRVA/m/IHoVWiJz5UIJ
Rich considers the nesting ability to be important. If the user is interacting with stdout/stdin, they can enter arbitrary other text UIs.
Sometimes a typechecker spots a ton of issues. I find that lists of numbers get very little benefit though.
I'm writing some messy logic that groups line numbers, and it's super easy to screw up.
Are there other cases? Strings might be another example.