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> So excited for this addition!

I've been using it for a while in the devel version (Nim v0.18.1), and it is great — I like it very much and I completely understand your excitement!

Before I didn't bother with {.noSideEffect.} pragma, and now with `func` here — my code is much more clear (at least to me ;)), and I can immediately tell which of my procs are 'pure'.

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What does it do?

It does some static enforcement of "no side effects[1]".

[1]https://en.m.wikipedia.org/wiki/Side_effect_(computer_scienc...

How? Even Haskell, who makes a big deal out of separating pure vs impure code, can't do it perfectly.

I don't think they claim they do it perfectly. You can find bugs related to that, false negatives and positives.

https://nim-lang.org/docs/manual.html#pragmas-nosideeffect-p...

It looks really impressive.

"Haskell is the world’s best imperative programming language"

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