Commits on Jun 18, 2020

1. Refactor hir::Place …

   For the following code
   ```rust
   let c = || bar(foo.x, foo.x)
   ```
   
   We generate two different `hir::Place`s for both `foo.x`.
   Handling this adds overhead for analysis we need to do for RFC 2229.
   
   We also want to store type information at each Projection to support
   analysis as part of the RFC. This resembles what we have for
   `mir::Place`
   
   This commit modifies the Place as follows:
   - Rename to `PlaceWithHirId`, where there `hir_id` is that of the
   expressioin.
   - Move any other information that describes the access out to another
   struct now called `Place`.
   - Removed `Span`, it can be accessed using the [hir
   API](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.span)
   - Modify `Projection` to be a strucutre of its own, that currently only
   contains the `ProjectionKind`.
   
   Adding type information to projections wil be completed as part of rust-lang/project-rfc-2229#5
   
   Closes rust-lang/project-rfc-2229#3
   
   Co-authored-by: Aman Arora <[email protected]>
   Co-authored-by: Roxane Fruytier <[email protected]>

   

   arora-aman and roxelo committed Jun 18, 2020
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