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Make a minimal amount of region APIs public Tools like Creusot, Prusti or Gillian-Rust need to access information about the loans and regions that exist in MIR programs. While `rustc` provides information about loans, there is currently no public way to reason about the regions present in a MIR program. In particular, we to know which regions are actually equal to each other and which ones outlive each other. Currently, `rustc` provides access to `RegionInferenceContext` but the public api hides that last portion of the information. This PR proposes to make a few apis public, allowing verifiers to reason about the lifetimes present in Rust programs: - [eval_equal](https://doc.rust-lang.org/beta/nightly-rustc/rustc_borrowck/region_infer/struct.RegionInferenceContext.html#method.eval_equal) - [eval_outlives](https://doc.rust-lang.org/beta/nightly-rustc/rustc_borrowck/region_infer/struct.RegionInferenceContext.html#method.eval_outlives) - (Optional) [constraint_sccs](https://doc.rust-lang.org/beta/nightly-rustc/rustc_borrowck/region_infer/struct.RegionInferenceContext.html#method.constraint_sccs) The first two functions would allow us to compare regions and from this we can construct the set of `RegionVid` which are actually equal to each other, and then recover the inclusions between those regions, while the second allows for more direct, but _low level_ access to that information. |
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