Simplify `HashStable` - #155018

Merged

rust-bors[bot] merged 8 commits into

rust-lang:mainfrom

nnethercote:simplify-HashStable

Apr 30, 2026

Commits on Apr 29, 2026

Avoid `hcx.def_path_hash(def_id)` calls.
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fc3a9a5
Move `HashStableContext` trait to `rustc_data_structures`.
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a6318f6
Overhaul stable hashing traits.
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36c9d23
Remove `derive(HashStable_Generic)`.
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087b422
Reduce `derive(HashStable_NoContext)`.
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f01d549
Remove `rustc_middle::ich::hcx` module.
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b7ba58e
Improve `impl HashStable for Features`.
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fa575bc
Add a useful comment to `NodeId::hash_stable`.
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20060c6