[ReleaseCandidat]

Eventlog is just `unsafePerfemIO*`, so you could just use that instead and not "hide" it and feel better about that.

The "correct" answer to `foldl` would be `scanl` and printing the result of it.

https://hackage.haskell.org/package/base-4.18.0.0/docs/Prelu...

[thesz]

Eventlog traces are RTS calls wrapped into unsafePerformIO, you are right. The trace part of eventlog is optimized for, well, tracing and is very, very lightweight. It is also safe from races, whereas simple unsafePerformIO (putStrLn $ "did you meant that? " ++ show (a,b,c)) is not.

In my opinion, eventlog traces make much better logging than almost anything I've seen.

Right now, developing with C++, I miss the power of Haskell's RTS.

[ReleaseCandidat]

The point I was trying to make was, that if all you want/need is a `putStr`, just use `unsafePerformIO`.

Haskell's (GHC's) Eventlog is nice, but a binary format and not comparable to text output.