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Update src/borrow_check/region_inference/placeholders_and_universes.md 

Co-Authored-By: Who? Me?! <mark-i-m@users.noreply.github.com>
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Niko Matsakis 2019-06-24 14:37:22 -04:00 committed by Who? Me?!
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src/borrow_check/region_inference/placeholders_and_universes.md
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@ -37,7 +37,7 @@ the type of `foo` the type `bar` expects
We handle this sort of subtyping by taking the variables that are
bound in the supertype and replacing them with
[universally quantified](../appendix/background.html#quantified)
representatives, written like `!1`. We call these regions "placeholder
representatives, denoted like `!1` here. We call these regions "placeholder
regions" – they represent, basically, "some unknown region".
Once we've done that replacement, we have the following relation: