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Update src/borrow_check/region_inference/constraint_propagation.md 

Co-Authored-By: Who? Me?! <mark-i-m@users.noreply.github.com>
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Niko Matsakis 2019-06-24 14:35:37 -04:00 committed by Who? Me?!
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src/borrow_check/region_inference/constraint_propagation.md
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@ -35,7 +35,7 @@ As a simple example, if we have a liveness constraint `R live at E`,
then we can apply `Values(R) = Values(R) union {E}` to make the
constraint be satisfied. Similarly, if we have an outlives constraints
`R1: R2`, we can apply `Values(R1) = Values(R1) union Values(R2)`.
(Member constraints are more complex and we discuss them below.)
(Member constraints are more complex and we discuss them [in this section][m_c].)
In practice, however, we are a bit more clever. Instead of applying
the constraints in a loop, we can analyze the constraints and figure