nightly feature tracking: get rid of the per-feature bool fields - #132027
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The
struct Featuresthat tracks which features are enabled has a ton of publicbool-typed fields that are basically caching the result of looking up the corresponding feature inenabled_lang_features. Having public fields with an invariant is not great, so at least they should be made private. However, it turns out caching these lookups is actually not worth it, so this PR just entirely gets rid of these fields. (The alternative would be to make them private and have a method for each of them to expose them in a read-only way. Most of the diff of this PR would be the same in that case.)r? @nnethercote