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Rollup merge of #94097 - pierwill:doc-rustc-middle-query, r=cjgillot

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Add module-level docs for `rustc_middle::query`
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Matthias Krüger 2022-02-20 00:37:29 +01:00 committed by GitHub
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compiler/rustc_middle/src/query/mod.rs
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@ -1,3 +1,9 @@
//! Defines the various compiler queries.
//!
//! For more information on the query system, see
//! ["Queries: demand-driven compilation"](https://rustc-dev-guide.rust-lang.org/query.html).
//! This chapter includes instructions for adding new queries.
// Each of these queries corresponds to a function pointer field in the
// `Providers` struct for requesting a value of that type, and a method
// on `tcx: TyCtxt` (and `tcx.at(span)`) for doing that request in a way