bd2b6c40bc
11513: internal: Expand the derive attribute into a pseudo expansion r=Veykril a=Veykril Quoting my comment: > We generate a very specific expansion here, as we do not actually expand the `#[derive]` attribute > itself in name res, but we do want to expand it to something for the IDE layer, so that the input > derive attributes can be downmapped, and resolved as proper paths. > This is basically a hack, that simplifies the hacks we need in a lot of ide layer places to > somewhat inconsistently resolve derive attributes. > > As such, we expand `#[derive(Foo, bar::Bar)]` into > ``` > #[Foo] > #[bar::Bar] > (); > ``` > which allows fallback path resolution in hir::Semantics to properly identify our derives. > Since we do not expand the attribute in nameres though, we keep the original item. > > The ideal expansion here would be for the `#[derive]` to re-emit the annotated item and somehow > use the input paths in its output as well. > But that would bring two problems with it, for one every derive would duplicate the item token tree > wasting a lot of memory, and it would also require some way to use a path in a way that makes it > always resolve as a derive without nameres recollecting them. > So this hacky approach is a lot more friendly for us, though it does require a bit of support in > [`hir::Semantics`] to make this work. Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
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