Rollup merge of #142678 - BoxyUwU:gai_cleanup, r=nnethercote

Misc cleanups of `generic_arg_infer` related HIR logic

r? ````@nnethercote````

compiler/rustc_ast_lowering/src/index.rs

@@ -311,7 +311,7 @@ impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
         );
 
         self.with_parent(const_arg.hir_id, |this| {
-            intravisit::walk_ambig_const_arg(this, const_arg);
+            intravisit::walk_const_arg(this, const_arg);
         });
     }
 

compiler/rustc_hir/src/hir.rs

@@ -412,10 +412,8 @@ impl<'hir> PathSegment<'hir> {
 /// that are [just paths](ConstArgKind::Path) (currently just bare const params)
 /// versus const args that are literals or have arbitrary computations (e.g., `{ 1 + 3 }`).
 ///
-/// The `Unambig` generic parameter represents whether the position this const is from is
-/// unambiguously a const or ambiguous as to whether it is a type or a const. When in an
-/// ambiguous context the parameter is instantiated with an uninhabited type making the
-/// [`ConstArgKind::Infer`] variant unusable and [`GenericArg::Infer`] is used instead.
+/// For an explanation of the `Unambig` generic parameter see the dev-guide:
+/// <https://rustc-dev-guide.rust-lang.org/hir/ambig-unambig-ty-and-consts.html>
 #[derive(Clone, Copy, Debug, HashStable_Generic)]
 #[repr(C)]
 pub struct ConstArg<'hir, Unambig = ()> {
@@ -427,7 +425,7 @@ pub struct ConstArg<'hir, Unambig = ()> {
 impl<'hir> ConstArg<'hir, AmbigArg> {
     /// Converts a `ConstArg` in an ambiguous position to one in an unambiguous position.
     ///
-    /// Functions accepting an unambiguous consts may expect the [`ConstArgKind::Infer`] variant
+    /// Functions accepting unambiguous consts may expect the [`ConstArgKind::Infer`] variant
     /// to be used. Care should be taken to separately handle infer consts when calling this
     /// function as it cannot be handled by downstream code making use of the returned const.
     ///
@@ -3314,14 +3312,12 @@ impl<'hir> AssocItemConstraintKind<'hir> {
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub enum AmbigArg {}
 
-#[derive(Debug, Clone, Copy, HashStable_Generic)]
-#[repr(C)]
 /// Represents a type in the `HIR`.
 ///
-/// The `Unambig` generic parameter represents whether the position this type is from is
-/// unambiguously a type or ambiguous as to whether it is a type or a const. When in an
-/// ambiguous context the parameter is instantiated with an uninhabited type making the
-/// [`TyKind::Infer`] variant unusable and [`GenericArg::Infer`] is used instead.
+/// For an explanation of the `Unambig` generic parameter see the dev-guide:
+/// <https://rustc-dev-guide.rust-lang.org/hir/ambig-unambig-ty-and-consts.html>
+#[derive(Debug, Clone, Copy, HashStable_Generic)]
+#[repr(C)]
 pub struct Ty<'hir, Unambig = ()> {
     #[stable_hasher(ignore)]
     pub hir_id: HirId,
@@ -3656,9 +3652,12 @@ pub enum InferDelegationKind {
 }
 
 /// The various kinds of types recognized by the compiler.
-#[derive(Debug, Clone, Copy, HashStable_Generic)]
+///
+/// For an explanation of the `Unambig` generic parameter see the dev-guide:
+/// <https://rustc-dev-guide.rust-lang.org/hir/ambig-unambig-ty-and-consts.html>
 // SAFETY: `repr(u8)` is required so that `TyKind<()>` and `TyKind<!>` are layout compatible
 #[repr(u8, C)]
+#[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub enum TyKind<'hir, Unambig = ()> {
     /// Actual type should be inherited from `DefId` signature
     InferDelegation(DefId, InferDelegationKind),

compiler/rustc_hir/src/intravisit.rs

@@ -364,9 +364,6 @@ pub trait Visitor<'v>: Sized {
     /// All types are treated as ambiguous types for the purposes of hir visiting in
     /// order to ensure that visitors can handle infer vars without it being too error-prone.
     ///
-    /// See the doc comments on [`Ty`] for an explanation of what it means for a type to be
-    /// ambiguous.
-    ///
     /// The [`Visitor::visit_infer`] method should be overridden in order to handle infer vars.
     fn visit_ty(&mut self, t: &'v Ty<'v, AmbigArg>) -> Self::Result {
         walk_ty(self, t)
@@ -375,12 +372,9 @@ pub trait Visitor<'v>: Sized {
     /// All consts are treated as ambiguous consts for the purposes of hir visiting in
     /// order to ensure that visitors can handle infer vars without it being too error-prone.
     ///
-    /// See the doc comments on [`ConstArg`] for an explanation of what it means for a const to be
-    /// ambiguous.
-    ///
     /// The [`Visitor::visit_infer`] method should be overridden in order to handle infer vars.
     fn visit_const_arg(&mut self, c: &'v ConstArg<'v, AmbigArg>) -> Self::Result {
-        walk_ambig_const_arg(self, c)
+        walk_const_arg(self, c)
     }
 
     #[allow(unused_variables)]
@@ -522,7 +516,7 @@ pub trait VisitorExt<'v>: Visitor<'v> {
     /// Named `visit_const_arg_unambig` instead of `visit_unambig_const_arg` to aid in
     /// discovery by IDes when `v.visit_const_arg` is written.
     fn visit_const_arg_unambig(&mut self, c: &'v ConstArg<'v>) -> Self::Result {
-        walk_const_arg(self, c)
+        walk_unambig_const_arg(self, c)
     }
 }
 impl<'v, V: Visitor<'v>> VisitorExt<'v> for V {}
@@ -985,7 +979,6 @@ pub fn walk_unambig_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty<'v>) ->
         Some(ambig_ty) => visitor.visit_ty(ambig_ty),
         None => {
             let Ty { hir_id, span, kind: _ } = typ;
-            try_visit!(visitor.visit_id(*hir_id));
             visitor.visit_infer(*hir_id, *span, InferKind::Ty(typ))
         }
     }
@@ -1043,7 +1036,7 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty<'v, AmbigArg>) -
     V::Result::output()
 }
 
-pub fn walk_const_arg<'v, V: Visitor<'v>>(
+pub fn walk_unambig_const_arg<'v, V: Visitor<'v>>(
     visitor: &mut V,
     const_arg: &'v ConstArg<'v>,
 ) -> V::Result {
@@ -1051,13 +1044,12 @@ pub fn walk_const_arg<'v, V: Visitor<'v>>(
         Some(ambig_ct) => visitor.visit_const_arg(ambig_ct),
         None => {
             let ConstArg { hir_id, kind: _ } = const_arg;
-            try_visit!(visitor.visit_id(*hir_id));
             visitor.visit_infer(*hir_id, const_arg.span(), InferKind::Const(const_arg))
         }
     }
 }
 
-pub fn walk_ambig_const_arg<'v, V: Visitor<'v>>(
+pub fn walk_const_arg<'v, V: Visitor<'v>>(
     visitor: &mut V,
     const_arg: &'v ConstArg<'v, AmbigArg>,
 ) -> V::Result {