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Use `AttrVec` for `Arm`, `FieldDef`, and `Variant` by JohnTitor · Pull Request #...
source link: https://github.com/rust-lang/rust/pull/86385
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Uses AttrVec for Arm, FieldDef, and Variant, i.e., where the size of the vector can be empty often.
Skips Crate and Item because I think they may have the attributes on common cases and need more work outside of rustc_ast (e.g. rustc_expand needs a lot of tweaks). But if it's reasonable to change, I'm happy to do so.
Fixes #77662
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