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A common pattern one might see in Haskell-adjacent programming languages is the use of higher-rank types as a mechanism for delimiting the scope in which certain values can be accessed, similar to lifetimes or regions in other languages.
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A common issue in impure ML-style languages with polymorphism and mutable references is the possibility of polymorphic references.
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One of OCaml’s flagship features is what they call “abstract types”.
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One of the more fundamental hurdles when implementing type classes is instance resolution.
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In part 31 of my crusade against GHC’s coherence guarantees, I have actually done it!
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If you read my previous post1 about local instances, you might have noticed something.
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When you first learned about Haskell’s Monoid typeclass, you were probably quite surprised to find out that there is no instance for Monoid Int in base.