3991cf6974
Rename, clarify, and document code for "erasing" query values In order to reduce compile times and code size for the compiler itself, the query system has a mechanism for “erasing” and ”restoring” query values in certain contexts. See https://github.com/rust-lang/rust/pull/109333 for the original implementation. Unfortunately, the erasure system has very little documentation, and involves a dizzying assortment of similarly-named types, traits, and functions. This PR therefore renames several parts of the erasure API and implementation to hopefully be clearer, and adds comments to better explain the purpose and mechanism behind value erasure. Summary of renames: - fn `erase` → `erase_val` (avoiding ambiguity with module `erase`) - fn `restore` → `restore_val` - type `Erase<T>` → `Erased<T>` (for actual erased values of `T`) - trait `EraseType` → `Erasable` (for types that can be erased and restored) - associated type `EraseType::Result` → `Erasable::Storage` - implementation-detail struct `Erased<T>` → `ErasedData<Storage>` There should be no change to compiler behaviour. |
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