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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 14:37:30 -04:00 committed by Who? Me?!
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src/borrow_check/region_inference/placeholders_and_universes.md
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@ -145,7 +145,7 @@ notion of universes, we can use it to extend our type-checker and
things to prevent illegal names from leaking out. The idea is that we
give each inference (existential) variable – whether it be a type or
a lifetime – a universe. That variable's value can then only
reference names visible from that universe. So for example is a
reference names visible from that universe. So for example if a
lifetime variable is created in U0, then it cannot be assigned a value
of `!1` or `!2`, because those names are not visible from the universe
U0.