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Update src/borrow_check/region_inference/constraint_propagation.md 

Co-Authored-By: lqd <remy.rakic+github@gmail.com>
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Niko Matsakis 2019-06-24 14:34:05 -04:00 committed by Who? Me?!
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src/borrow_check/region_inference/constraint_propagation.md
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@ -207,7 +207,7 @@ successors. Since SCCs form a DAG, we don't have to be concerned about
cycles, though we do need to keep a set around to track whether we
have already processed a given SCC or not. For each successor `S2`, once
we have computed `S2`'s value, we can union those elements into the
value for S1. (Although we have to be careful in this process to
value for `S1`. (Although we have to be careful in this process to
properly handle [higher-ranked
placeholders](./placeholders_and_universes.html). Note that the value
for S1 already contains the liveness constraints, since they were