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Github resolve/expand: Cache intermediate results of `#[derive]` expansion by pe...
source link: https://github.com/rust-lang/rust/pull/82907
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Expansion function for #[derive] (rustc_builtin_macros::derive::Expander::expand) may return an indeterminate result, and therefore can be called multiple times.
Previously we parsed the #[derive(Foo, Bar)]'s input and tried to resolve Foo and Bar on every such call.
Now we maintain a cache Resolver::derive_data and take all the necessary data from it if it was computed previously.
So Foo, Bar is now parsed at most once, and Foo and Bar are successfully resolved at most once.
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