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Haskell can actually do the "warn if it finds a problem" option: https://downloads.haskell.org/~ghc/7.8.2/docs/html/users_guide/defer-type-errors.html https://d

• JoelMcCracken 4y ago
  The existence of this option is what actually finally convinced me to give haskell a real try, but I have to say, I haven't actually ever used it. I alwyas just use undefined to defer any type error, actually seeing each spot there is an error and comprehending how to delay the problem for later basically seems to help me comprehend the problem I need to solve.