Worst ideas/features in programming languages?

[max haughton]

On Tuesday, 12 October 2021 at 17:48:04 UTC, Paul Backus wrote:
> On Tuesday, 12 October 2021 at 17:25:52 UTC, max haughton wrote:
>> [...]
>
> You can technically do this already with `foreach` and 
> `opApply`, although the result ends up looking kind of goofy:
>
> ```d
> foreach (b; a)
> foreach (c; b)
> foreach (d; c)
> e;
> ```
>
> Desugars to:
>
> ```d
> a.opApply(b =>
>     b.opApply(c =>
>         c.opApply(d => e)));
> ```
>
> ...which is almost the same thing as Haskell's `do` notation, 
> if you replace `>>=` with `opApply` and `x <- y` with `foreach 
> (x, y)`.
>
> This similarity is perhaps why Scala uses the `for` keyword for 
> [its version of `do` notation][1].
>
> [1]: https://docs.scala-lang.org/tour/for-comprehensions.html

I hate this and I hate you!

Nice trick though, wouldn't have thought to do that.