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Rollup merge of rust-lang#111840 - voidc:borrowck-consumers, r=oli-obk
Expose more information in `get_body_with_borrowck_facts` Verification tools for Rust such as, for example, Creusot or Prusti would benefit from having access to more information computed by the borrow checker. As a first step in that direction, rust-lang#86977 added the `get_body_with_borrowck_facts` API, allowing compiler consumers to obtain a `mir::Body` with accompanying borrow checker information. At RustVerify 2023, multiple people working on verification tools expressed their need for a more comprehensive API. While eventually borrow information could be part of Stable MIR, in the meantime, this PR proposes a more limited approach, extending the existing `get_body_with_borrowck_facts` API. In summary, we propose the following changes: - Permit obtaining the borrow-checked body without necessarily running Polonius - Return the `BorrowSet` and the `RegionInferenceContext` in `BodyWithBorrowckFacts` - Provide a way to compute the `borrows_out_of_scope_at_location` map - Make some helper methods public This is similar to rust-lang#108328 but smaller in scope. `@smoelius` Do you think these changes would also be sufficient for your needs? r? `@oli-obk` cc `@JonasAlaif`
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