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Hash spans when interning types Ignoring hash for spans creates an inconsistency between the `Hash` impl for `WithStableHash`, which takes them into account, and the `HashStable` impl which does not. cc `@compiler-errors` Fixes https://github.com/rust-lang/rust/issues/104271 Fixes https://github.com/rust-lang/rust/issues/104255 Fixes https://github.com/rust-lang/rust/issues/104238
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