hir: Use `InferArg` in `ArrayLen::Infer`

compiler/rustc_ast_lowering/src/lib.rs

@@ -2305,7 +2305,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         match c.value.kind {
             ExprKind::Underscore => {
                 if self.tcx.features().generic_arg_infer {
-                    hir::ArrayLen::Infer(self.lower_node_id(c.id), self.lower_span(c.value.span))
+                    hir::ArrayLen::Infer(hir::InferArg {
+                        hir_id: self.lower_node_id(c.id),
+                        span: self.lower_span(c.value.span),
+                    })
                 } else {
                     feature_err(
                         &self.tcx.sess,

compiler/rustc_hir/src/hir.rs

@@ -1531,14 +1531,16 @@ pub type Lit = Spanned<LitKind>;
 
 #[derive(Copy, Clone, Debug, HashStable_Generic)]
 pub enum ArrayLen {
-    Infer(HirId, Span),
+    Infer(InferArg),
     Body(AnonConst),
 }
 
 impl ArrayLen {
     pub fn hir_id(&self) -> HirId {
         match self {
-            &ArrayLen::Infer(hir_id, _) | &ArrayLen::Body(AnonConst { hir_id, .. }) => hir_id,
+            ArrayLen::Infer(InferArg { hir_id, .. }) | ArrayLen::Body(AnonConst { hir_id, .. }) => {
+                *hir_id
+            }
         }
     }
 }
@@ -2423,7 +2425,7 @@ impl<'hir> Ty<'hir> {
             TyKind::Infer => true,
             TyKind::Slice(ty) => ty.is_suggestable_infer_ty(),
             TyKind::Array(ty, length) => {
-                ty.is_suggestable_infer_ty() || matches!(length, ArrayLen::Infer(_, _))
+                ty.is_suggestable_infer_ty() || matches!(length, ArrayLen::Infer(..))
             }
             TyKind::Tup(tys) => tys.iter().any(Self::is_suggestable_infer_ty),
             TyKind::Ptr(mut_ty) | TyKind::Ref(_, mut_ty) => mut_ty.ty.is_suggestable_infer_ty(),

compiler/rustc_hir/src/intravisit.rs

@@ -669,7 +669,7 @@ pub fn walk_pat_field<'v, V: Visitor<'v>>(visitor: &mut V, field: &'v PatField<'
 
 pub fn walk_array_len<'v, V: Visitor<'v>>(visitor: &mut V, len: &'v ArrayLen) {
     match len {
-        &ArrayLen::Infer(hir_id, _span) => visitor.visit_id(hir_id),
+        ArrayLen::Infer(InferArg { hir_id, span: _ }) => visitor.visit_id(*hir_id),
         ArrayLen::Body(c) => visitor.visit_anon_const(c),
     }
 }

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -2529,7 +2529,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             }
             hir::TyKind::Array(ty, length) => {
                 let length = match length {
-                    &hir::ArrayLen::Infer(_, span) => self.ct_infer(tcx.types.usize, None, span),
+                    hir::ArrayLen::Infer(inf) => self.ct_infer(tcx.types.usize, None, inf.span),
                     hir::ArrayLen::Body(constant) => {
                         ty::Const::from_anon_const(tcx, constant.def_id)
                     }

compiler/rustc_hir_analysis/src/collect.rs

@@ -146,8 +146,8 @@ impl<'v> Visitor<'v> for HirPlaceholderCollector {
         }
     }
     fn visit_array_length(&mut self, length: &'v hir::ArrayLen) {
-        if let &hir::ArrayLen::Infer(_, span) = length {
-            self.0.push(span);
+        if let hir::ArrayLen::Infer(inf) = length {
+            self.0.push(inf.span);
         }
         intravisit::walk_array_len(self, length)
     }

compiler/rustc_hir_pretty/src/lib.rs

@@ -956,7 +956,7 @@ impl<'a> State<'a> {
 
     fn print_array_length(&mut self, len: &hir::ArrayLen) {
         match len {
-            hir::ArrayLen::Infer(_, _) => self.word("_"),
+            hir::ArrayLen::Infer(..) => self.word("_"),
             hir::ArrayLen::Body(ct) => self.print_anon_const(ct),
         }
     }

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -405,7 +405,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     pub fn array_length_to_const(&self, length: &hir::ArrayLen) -> ty::Const<'tcx> {
         match length {
-            &hir::ArrayLen::Infer(_, span) => self.ct_infer(self.tcx.types.usize, None, span),
+            hir::ArrayLen::Infer(inf) => self.ct_infer(self.tcx.types.usize, None, inf.span),
             hir::ArrayLen::Body(anon_const) => {
                 let span = self.tcx.def_span(anon_const.def_id);
                 let c = ty::Const::from_anon_const(self.tcx, anon_const.def_id);

src/librustdoc/clean/mod.rs

@@ -1835,7 +1835,7 @@ pub(crate) fn clean_ty<'tcx>(ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> T
         TyKind::Slice(ty) => Slice(Box::new(clean_ty(ty, cx))),
         TyKind::Array(ty, ref length) => {
             let length = match length {
-                hir::ArrayLen::Infer(_, _) => "_".to_string(),
+                hir::ArrayLen::Infer(..) => "_".to_string(),
                 hir::ArrayLen::Body(anon_const) => {
                     // NOTE(min_const_generics): We can't use `const_eval_poly` for constants
                     // as we currently do not supply the parent generics to anonymous constants