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Introduce UnordMap, UnordSet, and UnordBag (MCP 533) This is the start of implementing [MCP 533](https://github.com/rust-lang/compiler-team/issues/533). I followed `@eddyb's` suggestion of naming the collection types `Unord(Map/Set/Bag)` which is a bit easier to type than `Unordered(Map/Set/Bag)` r? `@eddyb`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.