borrowck: Represent 'best blame constraint' as index into Vec<OutlivesConstraint>#158623
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Enselic wants to merge 4 commits into
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borrowck: Represent 'best blame constraint' as index into Vec<OutlivesConstraint>#158623Enselic wants to merge 4 commits into
Vec<OutlivesConstraint>#158623Enselic wants to merge 4 commits into
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So that we in an upcoming commit can return the index into path instead
of a "duplicate".
This passes:
./x test --bless tests/ui --keep-stage-std 1 --set rust.deny-warnings=false
…esConstraint>` This makes the code simpler and easier to understand, since we don't have to partially copy an `OutlivesConstraint` into the `BlameConstraint` struct (which we can remove entirely) and the `BorrowExplanation::MustBeValidFor` enum variant (which we can simplify). Instead, we reference the "best" `OutlivesConstraint` by an index into `Vec<OutlivesConstraint>`. This is not only simpler, it also opens up the possibility for diagnostics to access the full `OutlivesConstraint` info.
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This makes the code simpler and easier to understand, since we don't have to partially copy an
OutlivesConstraintinto theBlameConstraintstruct (which we can remove entirely) and theBorrowExplanation::MustBeValidForenum variant (which we can simplify).Instead, we reference the "best"
OutlivesConstraintby an index intoVec<OutlivesConstraint>. This is not only simpler, it also opens up the possibility for diagnostics to access the fullOutlivesConstraintinfo.I discovered this cleanup while investigating ways to solve #138408.
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This PR is not ready for review. I will split this up into smaller PRs for easier review. The purpose of this PR is to: