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do you know of a post or something you could point to that elaborates that argument? interested because I'm having trouble coming up with the line of reasoning on my own

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I'm having trouble finding anything concrete online (other than people simply repeating the folk wisdom) other than control flow operators, which are implemented as normal functions in Haskell (i.e. including custom control flow operators).[0] Although, one Reddit comment[1] did also mention typeclasses as obviating other types of macros, so I've edited my earlier comment accordingly.

[0] https://www.reddit.com/r/haskell/comments/5xge0v/comment/deh...

[1] https://www.reddit.com/r/haskell/comments/1929xn/comment/c8k...

This is not a direct response to the question of how laziness obviates the need for macros, but it mentions some specific relevant cases:

https://augustss.blogspot.com/2011/05/more-points-for-lazy-e...

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