Commit 07bfd00

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Add link to Providers and ExternProviders in Query System of rdg

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

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Lines changed: 5 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -78,6 +78,9 @@ during compiler initialization. The macro system generates both structs,`
`78`	`78`	`which act as function tables for all query implementations, where each`
`79`	`79`	`field is a function pointer to the actual provider.`
`80`	`80`
	`81`	`+[providers_struct]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/query/struct.Providers.html`
	`82`	`+[extern_providers_struct]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/query/struct.ExternProviders.html`
	`83`	`+`
`81`	`84`	Note: Both the `Providers` and `ExternProviders` structs are generated by macros and act as function tables for all query implementations.
`82`	`85`	`They are not Rust traits, but plain structs with function pointer fields.`
`83`	`86`
`@@ -268,4 +271,5 @@ More discussion and issues:`
`268`	`271`	`["Red/Green" dependency tracking in compiler]: https://github.com/rust-lang/rust/issues/42293`
`269`	`272`	`[GitHub issue #42633]: https://github.com/rust-lang/rust/issues/42633`
`270`	`273`	`[Incremental Compilation Beta]: https://internals.rust-lang.org/t/incremental-compilation-beta/4721`
`271`		`-[Incremental Compilation Announcement]: https://blog.rust-lang.org/2016/09/08/incremental.html`
	`274`	`+[Incremental Compilation Announcement]: https://blog.rust-lang.org/2016/09/08/incremental.html`
	`275`	`+`

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