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Small syntax error #9

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2 changes: 1 addition & 1 deletion chapters/primitive-haskell.md
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Expand Up @@ -292,7 +292,7 @@ removed](https://github.com/haskell/primitive/pull/19). In fact, at the time
you're reading this, it may already be gone!

`PrimState` is an associated type giving the type of the state token. For `IO`,
that's `RealWorld, and for `ST s`, it's `s`. `primitive` gives a way to lift
that's `RealWorld`, and for `ST s`, it's `s`. `primitive` gives a way to lift
the internal implementation of both `IO` and `ST` to the monad under question.

__Exercise__: Write implementations of the `PrimMonad IO` and `PrimMonad (ST s)` instances, and compare against the real ones.
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