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e980c62955
Cached stable hash cleanups r? `@nnethercote` Add a sanity assertion in debug mode to check that the cached hashes are actually the ones we get if we compute the hash each time. Add a new data structure that bundles all the hash-caching work to make it easier to re-use it for different interned data structures
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.