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Dec 5, 2024
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update section even more #2156

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10 changes: 9 additions & 1 deletion src/borrow_check/region_inference/closure_constraints.md
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Expand Up @@ -11,7 +11,15 @@ they hold, we report an error.

## How this is implemented

While borrow-checking a closure inside of `RegionInferenceContext::solve` we call `check_type_tests` with a list of `outlives_requirements` to propagate to the caller. This happens after computing the outlives graph, which is now immutable.
While borrow-checking a closure inside of `RegionInferenceContext::solve` we separately try to propagate type-outlives and region-outlives constraints to the parent if we're unable to prove them locally.

### Region-outlive constraints

If we fail to prove a region-outlives constraint, we try to propagate it in `fn try_propagate_universal_region_error`.

### Type-outlive constraints

Type-outlives constraints are proven in `check_type_tests`. This happens after computing the outlives graph, which is now immutable.

For all type tests we fail to prove via `fn eval_verify_bound` inside of the closure we call `try_promote_type_test`. A `TypeTest` represents a type-outlives bound `generic_kind: lower_bound` together with a `verify_bound`. If the `VerifyBound` holds for the `lower_bound`, the constraint is satisfied. `try_promote_type_test` does not care about the ` verify_bound`.

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