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Add feedable query modifier #2942

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Add feedable query modifier #2942

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7 changes: 7 additions & 0 deletions src/queries/incremental-compilation-in-detail.md
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Expand Up @@ -485,6 +485,12 @@ respect to incremental compilation:
be cached to disk for "local" keys, because values for external crates should
be loadable from crate metadata instead.

- `feedable` - The query is not actually a function, but it's own arena type. This
is done to declare an arena, "feed" the information
to store at a later point in the compilation (for example, when we actually have a
`Crate` object available), and then retrieve it as any other crate. Thus, function
definitions for these queries do not exist.

[mod]: ../query.html#adding-a-new-kind-of-query


Expand Down Expand Up @@ -554,3 +560,4 @@ See <https://github.com/rust-lang/rust/issues/47389> for more information.

[query-model]: ./query-evaluation-model-in-detail.html
[try_mark_green]: https://doc.rust-lang.org/nightly/nightly-rustc/src/rustc_middle/dep_graph/graph.rs.html
[`crate_for_resolver`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TyCtxtFeed.html#method.crate_for_resolver
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