Fix rustc-related links that are 404 right now (#2112)

Author: marxin

Diff for: src/appendix/code-index.md

@@ -6,10 +6,10 @@ compiler.
 
 Item            |  Kind    | Short description           | Chapter            | Declaration
 ----------------|----------|-----------------------------|--------------------|-------------------
-`BodyId` | struct | One of four types of HIR node identifiers | [Identifiers in the HIR] | [compiler/rustc_hir/src/hir.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.BodyId.html)
+`BodyId` | struct | One of four types of HIR node identifiers | [Identifiers in the HIR] | [compiler/rustc_hir/src/hir.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.BodyId.html)
 `Compiler` | struct | Represents a compiler session and can be used to drive a compilation. | [The Rustc Driver and Interface] | [compiler/rustc_interface/src/interface.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/interface/struct.Compiler.html)
 `ast::Crate` | struct | A syntax-level representation of a parsed crate | [The parser] | [compiler/rustc_ast/src/ast.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/struct.Crate.html)
-`rustc_hir::Crate` | struct | A more abstract, compiler-friendly form of a crate's AST | [The Hir] | [compiler/rustc_hir/src/hir.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Crate.html)
+`rustc_hir::Crate` | struct | A more abstract, compiler-friendly form of a crate's AST | [The Hir] | [compiler/rustc_hir/src/hir.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Crate.html)
 `DefId` | struct | One of four types of HIR node identifiers | [Identifiers in the HIR] | [compiler/rustc_hir/src/def_id.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/def_id/struct.DefId.html)
 `Diag` | struct | A struct for a compiler diagnostic, such as an error or lint | [Emitting Diagnostics] | [compiler/rustc_errors/src/diagnostic.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/struct.Diag.html)
 `DocContext` | struct | A state container used by rustdoc when crawling through a crate to gather its documentation | [Rustdoc] | [src/librustdoc/core.rs](https://github.com/rust-lang/rust/blob/master/src/librustdoc/core.rs)

Diff for: src/hir.md

@@ -37,7 +37,7 @@ data structure basically just contains the root module, the HIR
 `Crate` structure contains a number of maps and other things that
 serve to organize the content of the crate for easier access.
 
-[`Crate`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Crate.html
+[`Crate`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Crate.html
 
 For example, the contents of individual items (e.g. modules,
 functions, traits, impls, etc) in the HIR are not immediately
@@ -55,7 +55,7 @@ struct) would only have the **`ItemId`** `I` of `bar()`. To get the
 details of the function `bar()`, we would lookup `I` in the
 `items` map.
 
-[`Mod`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Mod.html
+[`Mod`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Mod.html
 
 One nice result from this representation is that one can iterate
 over all items in the crate by iterating over the key-value pairs
@@ -72,7 +72,7 @@ function to lookup the contents of `bar()` given its id; this gives
 the compiler a chance to observe that you accessed the data for
 `bar()`, and then record the dependency.
 
-[`&rustc_hir::Item`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Item.html
+[`&rustc_hir::Item`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Item.html
 
 <a name="hir-id"></a>
 
@@ -120,9 +120,9 @@ that `n` must be some HIR expression, you can do
 [`&hir::Expr`][Expr], panicking if `n` is not in fact an expression.
 
 [find]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.find
-[`Node`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/enum.Node.html
+[`Node`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/enum.Node.html
 [expect_expr]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.expect_expr
-[Expr]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Expr.html
+[Expr]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Expr.html
 
 Finally, you can use the HIR map to find the parents of nodes, via
 calls like [`tcx.hir().get_parent(n)`][get_parent].
@@ -139,6 +139,6 @@ associated with an **owner**, which is typically some kind of item
 associated with a given def-id ([`maybe_body_owned_by`]) or to find
 the owner of a body ([`body_owner_def_id`]).
 
-[`rustc_hir::Body`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Body.html
+[`rustc_hir::Body`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Body.html
 [`maybe_body_owned_by`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.maybe_body_owned_by
 [`body_owner_def_id`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.body_owner_def_id

Diff for: src/identifiers.md

@@ -52,10 +52,10 @@ See the [HIR chapter][hir-map] for more detailed information.
 [`DefId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/def_id/struct.DefId.html
 [`LocalDefId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/def_id/struct.LocalDefId.html
 [`HirId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir_id/struct.HirId.html
-[`BodyId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.BodyId.html
+[`BodyId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.BodyId.html
 [`CrateNum`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/def_id/struct.CrateNum.html
 [`DefIndex`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/def_id/struct.DefIndex.html
-[`Body`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Body.html
+[`Body`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Body.html
 [Node]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/enum.Node.html
 [hir-map]: ./hir.md#the-hir-map
 [hir-bodies]: ./hir.md#hir-bodies

Diff for: src/mir/optimizations.md

@@ -84,7 +84,7 @@ The array is an array of `&dyn MirPass` trait objects. Typically, a pass is
 implemented in its own module of the [`rustc_mir_transform`][trans] crate.
 
 [rop]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/fn.run_optimization_passes.html
-[`MirPass`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/mir/trait.MirPass.html
+[`MirPass`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/pass_manager/trait.MirPass.html
 [trans]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/index.html
 
 Some examples of passes are:
@@ -94,7 +94,7 @@ Some examples of passes are:
 
 You can see the ["Implementors" section of the `MirPass` rustdocs][impl] for more examples.
 
-[impl]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/mir/trait.MirPass.html#implementors
+[impl]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/pass_manager/trait.MirPass.html#implementors
 [constprop]: https://en.wikipedia.org/wiki/Constant_folding#Constant_propagation
 
 ## MIR optimization levels

Diff for: src/mir/passes.md

@@ -168,7 +168,7 @@ queries are called before it actually steals, thus ensuring that the reads have
 simply loads from a cache the second time).
 
 [rust-lang/rust#41710]: https://github.com/rust-lang/rust/issues/41710
-[mirpass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/mir/trait.MirPass.html
+[mirpass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/pass_manager/trait.MirPass.html
 [lint1]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/check_packed_ref/struct.CheckPackedRef.html
 [lint2]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/check_const_item_mutation/struct.CheckConstItemMutation.html
 [lint3]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_transform/function_item_references/struct.FunctionItemReferences.html

Diff for: src/opaque-types-impl-trait-inference.md

@@ -55,7 +55,7 @@ which is provable from the bounds declared on `Seq<T>`.
 
 Let's start by looking what happens when we type-check `main`.
 Initially we invoke `produce_singleton` and the return type is an opaque type
-[`OpaqueTy`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/enum.ItemKind.html#variant.OpaqueTy).
+[`OpaqueTy`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/enum.ItemKind.html#variant.OpaqueTy).
 
 #### Type-checking the for loop
 

Diff for: src/rustdoc-internals.md

@@ -78,7 +78,7 @@ which describe the publicly-documentable items in the target crate.
 [`core.rs`]: https://github.com/rust-lang/rust/blob/master/src/librustdoc/core.rs
 [`Item`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/clean/types/struct.Item.html
 [`run_global_ctxt`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/core/fn.run_global_ctxt.html
-[`rustc_hir::Crate`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Crate.html
+[`rustc_hir::Crate`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Crate.html
 [`rustdoc::core::DocContext`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/core/struct.DocContext.html
 [`rustdoc::core::run_global_ctxt`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/core/fn.run_global_ctxt.html
 [`visit_ast::Module`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/visit_ast/struct.Module.html

Diff for: src/thir.md

@@ -35,7 +35,7 @@ But it has some other interesting features that distinguish it from the HIR:
 
 [HIR]: ./hir.md
 [`ExprId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/thir/struct.ExprId.html
-[body owners]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/enum.BodyOwnerKind.html
+[body owners]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/enum.BodyOwnerKind.html
 
 The THIR lives in [`rustc_mir_build::thir`][thir-docs]. To construct a [`thir::Expr`],
 you can use the [`thir_body`] function, passing in the memory arena where the THIR

Diff for: src/ty.md

@@ -17,7 +17,7 @@ The specific `Ty` we are referring to is [`rustc_middle::ty::Ty`][ty_ty] (and no
 into the details of `ty::Ty`.
 
 [ty_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.Ty.html
-[hir_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Ty.html
+[hir_ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Ty.html
 
 ## `rustc_hir::Ty` vs `ty::Ty`
 
@@ -65,7 +65,7 @@ Here is a summary:
 | `fn foo(x: u32) → u32 { }` - Two `rustc_hir::Ty` representing each usage of `u32`, each has its own `Span`s, and `rustc_hir::Ty` doesn’t tell us that both are the same type | `fn foo(x: u32) → u32 { }` - One `ty::Ty` for all instances of `u32` throughout the program, and `ty::Ty` tells us that both usages of `u32` mean the same type. |
 | `fn foo(x: &u32) -> &u32)` - Two `rustc_hir::Ty` again. Lifetimes for the references show up in the `rustc_hir::Ty`s using a special marker, [`LifetimeName::Implicit`][implicit]. | `fn foo(x: &u32) -> &u32)`- A single `ty::Ty`. The `ty::Ty` has the hidden lifetime param. |
 
-[implicit]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/enum.LifetimeName.html#variant.Implicit
+[implicit]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/enum.LifetimeName.html#variant.Implicit
 
 **Order**