Note that the repl (ghci) has had a time-travelling debugger since ~forever https://donsbot.com/2007/11/14/no-more-exceptions-debugging-haskell-code-with-ghci/

Note that the repl (ghci) has had a time-travelling debugger since ~forever https://donsbot.com/2007/11/14/no-more-exceptions-debugging-haskell-code-with-ghci/ https://donsbot.com/2007/11/14/no-more-exceptions-debugging-... What's missing is the same for your compiled binaries, with UI for inspection etc. Maybe https://hackage.haskell.org/package/haskell-debug-adapter https://hackage.haskell.org/package/haskell-debug-adapter will some day be non-experimental.