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Small language fix in subtyping.md (#399)

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Martin 2 years ago committed by GitHub
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@ -339,7 +339,7 @@ lifetimes to be covariant: as soon as you try to stuff them in something like a
mutable reference, they inherit invariance and you're prevented from doing anything mutable reference, they inherit invariance and you're prevented from doing anything
bad. bad.
However Box makes it easier to focus on by-value aspect of references that we However, Box makes it easier to focus on the by-value aspect of references that we
partially glossed over. partially glossed over.
Unlike a lot of languages which allow values to be freely aliased at all times, Unlike a lot of languages which allow values to be freely aliased at all times,

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