rust/compiler/rustc_smir
bors 698fcc8219 Auto merge of #117517 - klinvill:smir-projections, r=ouz-a
Add richer structure for Stable MIR Projections

Resolves https://github.com/rust-lang/project-stable-mir/issues/49.

Projections in Stable MIR are currently just strings. This PR replaces that representation with a richer structure, namely projections become vectors of `ProjectionElem`s, just as in MIR. The `ProjectionElem` enum is heavily based off of the MIR `ProjectionElem`.

This PR is a draft since there are several outstanding issues to resolve, including:

- How should `UserTypeProjection`s be represented in Stable MIR? In MIR, the projections are just a vector of `ProjectionElem<(),()>`, meaning `ProjectionElem`s that don't have Local or Type arguments (for `Index`, `Field`, etc. objects). Should `UserTypeProjection`s be represented this way in Stable MIR as well? Or is there a more user-friendly representation that wouldn't drag along all the `ProjectionElem` variants that presumably can't appear?
- What is the expected behavior of a `Place`'s `ty` function? Should it resolve down the chain of projections so that something like `*_1.f` would return the type referenced by field `f`?
- Tests should be added for `UserTypeProjection`
2023-11-15 06:05:54 +00:00
..
src Auto merge of #117517 - klinvill:smir-projections, r=ouz-a 2023-11-15 06:05:54 +00:00
.gitignore Add 'compiler/rustc_smir/' from commit '9abcb5c7b574cf316eb23d3f469187bb86ba3019' 2022-06-02 10:07:25 +00:00
Cargo.toml Clean up rustc_*/Cargo.toml. 2023-10-30 08:46:02 +11:00