[wlamartin]

I think in a language designed around FP ergonomics and expectations there's a lot to like about it.

In your second example, as a retrofit, I find myself asking "when does MapErr stop consuming the input list?", "which error gets returned if multiple errors could be returned?", "is it a errors.Joim situation", "if there are multiple errors how do I map them to the failed elements in parsed", "if I did want each parse to have either success or fail (think Result type) how would I represent this generically in a language that favours multiple return types"

There's a lot going on with that example that a for loop makes explicit and flexible for other choices.