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| author | Corey Farwell <coreyf@rwell.org> | 2017-05-05 17:35:29 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-05-05 17:35:29 -0400 |
| commit | 26e067b058102e3dcfef461a3f45f403fd456bb8 (patch) | |
| tree | c9201a1edd4d92eb6fd8b0ca98b8bb0bf8dba03c /src/test/incremental/thinlto | |
| parent | 9b2aacfdbe9569666d2d723bcde78ba3deef41a0 (diff) | |
| parent | 3da5daf42587c9cece98a7b0985215cc40c31d58 (diff) | |
| download | rust-26e067b058102e3dcfef461a3f45f403fd456bb8.tar.gz rust-26e067b058102e3dcfef461a3f45f403fd456bb8.zip | |
Rollup merge of #41734 - nikomatsakis:incr-comp-refactor-variance, r=pnkfelix
Refactor variance and remove last `[pub]` map
This PR refactors variance to work in a more red-green friendly way. Because red-green doesn't exist yet, it has to be a bit hacky. The basic idea is this:
- We compute a big map with the variance for all items in the crate; when you request variances for a particular item, we read it from the crate
- We now hard-code that traits are invariant (which they are, for deep reasons, not gonna' change)
- When building constraints, we compute the transitive closure of all things within the crate that depend on what using `TransitiveRelation`
- this lets us gin up the correct dependencies when requesting variance of a single item
Ah damn, just remembered, one TODO:
- [x] Update the variance README -- ah, I guess the README updates I did are sufficient
r? @michaelwoerister
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