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Mark Mansi 2019-06-26 14:26:14 -05:00
parent 13af334f2d
commit b32b9ae934
2 changed files with 6 additions and 6 deletions
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6
src/borrow_check/region_inference/constraint_propagation.md
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@ -11,7 +11,7 @@ on one at a time (each of them is fairly independent from the others):
- [member constraints][m_c] (`member R_m of [R_c...]`), which arise from impl Trait.
[`propagate_constraints`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir/borrow_check/nll/region_infer/struct.RegionInferenceContext.html#method.propagate_constraints
[m_c]: ./member_constraints.html
[m_c]: ./member_constraints.md
In this chapter, we'll explain the "heart" of constraint propagation,
covering both liveness and outlives constraints.
@ -29,7 +29,7 @@ given some set of constraints `{C}` and it computes a set of values
- For each constraint C:
- Update `Values` as needed to satisfy the constraint
[riv]: ../region-inference.html#region-variables
[riv]: ../region_inference.md#region-variables
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
@ -55,7 +55,7 @@ includes a region R is live at some [point] P. This simply means that
the value of R must include the point P. Liveness constraints are
computed by the MIR type checker.
[point]: ../../appendix/glossary.html
[point]: ../../appendix/glossary.md
A liveness constraint `R live at E` is satisfied if `E` is a member of
`Values(R)`. So to "apply" such a constraint to `Values`, we just have

6
src/borrow_check/region_inference/placeholders_and_universes.md
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@ -36,7 +36,7 @@ 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)
[universally quantified](../../appendix/background.md#quantified)
representatives, denoted like `!1` here. We call these regions "placeholder
regions" – they represent, basically, "some unknown region".
@ -53,7 +53,7 @@ what we wanted.
So let's work through what happens next. To check if two functions are
subtypes, we check if their arguments have the desired relationship
(fn arguments are [contravariant](../appendix/background.html#variance), so
(fn arguments are [contravariant](../../appendix/background.md#variance), so
we swap the left and right here):
```text
@ -92,7 +92,7 @@ Here, the root universe would consist of the lifetimes `'static` and
the same concept to types, in which case the types `Foo` and `T` would
be in the root universe (along with other global types, like `i32`).
Basically, the root universe contains all the names that
[appear free](../appendix/background.html#free-vs-bound) in the body of `bar`.
[appear free](../../appendix/background.md#free-vs-bound) in the body of `bar`.
Now let's extend `bar` a bit by adding a variable `x`: