5 files changed, 21 insertions, 10 deletions
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index d4dfb9f2973..5cf231d5668 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -3373,13 +3373,16 @@ pub struct OpaqueTy<'hir> {
     pub span: Span,
 }
 
-#[derive(Debug, Clone, Copy, HashStable_Generic)]
-pub enum PreciseCapturingArg<'hir> {
-    Lifetime(&'hir Lifetime),
+#[derive(Debug, Clone, Copy, HashStable_Generic, Encodable, Decodable)]
+pub enum PreciseCapturingArgKind<T, U> {
+    Lifetime(T),
     /// Non-lifetime argument (type or const)
-    Param(PreciseCapturingNonLifetimeArg),
+    Param(U),
 }
 
+pub type PreciseCapturingArg<'hir> =
+    PreciseCapturingArgKind<&'hir Lifetime, PreciseCapturingNonLifetimeArg>;
+
 impl PreciseCapturingArg<'_> {
     pub fn hir_id(self) -> HirId {
         match self {
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index cfb6cf8a287..e0e435dd6f0 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -28,7 +28,7 @@ use rustc_errors::{
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{self, InferKind, Visitor, VisitorExt, walk_generics};
-use rustc_hir::{self as hir, GenericParamKind, HirId, Node};
+use rustc_hir::{self as hir, GenericParamKind, HirId, Node, PreciseCapturingArgKind};
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_infer::traits::ObligationCause;
 use rustc_middle::hir::nested_filter;
@@ -1791,7 +1791,7 @@ fn opaque_ty_origin<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> hir::OpaqueT
 fn rendered_precise_capturing_args<'tcx>(
     tcx: TyCtxt<'tcx>,
     def_id: LocalDefId,
-) -> Option<&'tcx [Symbol]> {
+) -> Option<&'tcx [PreciseCapturingArgKind<Symbol, Symbol>]> {
     if let Some(ty::ImplTraitInTraitData::Trait { opaque_def_id, .. }) =
         tcx.opt_rpitit_info(def_id.to_def_id())
     {
@@ -1800,7 +1800,12 @@ fn rendered_precise_capturing_args<'tcx>(
 
     tcx.hir_node_by_def_id(def_id).expect_opaque_ty().bounds.iter().find_map(|bound| match bound {
         hir::GenericBound::Use(args, ..) => {
-            Some(&*tcx.arena.alloc_from_iter(args.iter().map(|arg| arg.name())))
+            Some(&*tcx.arena.alloc_from_iter(args.iter().map(|arg| match arg {
+                PreciseCapturingArgKind::Lifetime(_) => {
+                    PreciseCapturingArgKind::Lifetime(arg.name())
+                }
+                PreciseCapturingArgKind::Param(_) => PreciseCapturingArgKind::Param(arg.name()),
+            })))
         }
         _ => None,
     })
diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs
index 7b34e605c53..5536c93f84a 100644
--- a/compiler/rustc_metadata/src/rmeta/mod.rs
+++ b/compiler/rustc_metadata/src/rmeta/mod.rs
@@ -10,6 +10,7 @@ use rustc_abi::{FieldIdx, ReprOptions, VariantIdx};
 use rustc_ast::expand::StrippedCfgItem;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::svh::Svh;
+use rustc_hir::PreciseCapturingArgKind;
 use rustc_hir::def::{CtorKind, DefKind, DocLinkResMap};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIndex, DefPathHash, StableCrateId};
 use rustc_hir::definitions::DefKey;
@@ -440,7 +441,7 @@ define_tables! {
     coerce_unsized_info: Table<DefIndex, LazyValue<ty::adjustment::CoerceUnsizedInfo>>,
     mir_const_qualif: Table<DefIndex, LazyValue<mir::ConstQualifs>>,
     rendered_const: Table<DefIndex, LazyValue<String>>,
-    rendered_precise_capturing_args: Table<DefIndex, LazyArray<Symbol>>,
+    rendered_precise_capturing_args: Table<DefIndex, LazyArray<PreciseCapturingArgKind<Symbol, Symbol>>>,
     asyncness: Table<DefIndex, ty::Asyncness>,
     fn_arg_names: Table<DefIndex, LazyArray<Ident>>,
     coroutine_kind: Table<DefIndex, hir::CoroutineKind>,
diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 781a898a6e9..94a5a3769a3 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -25,7 +25,7 @@ use rustc_hir::def_id::{
     CrateNum, DefId, DefIdMap, LocalDefId, LocalDefIdMap, LocalDefIdSet, LocalModDefId,
 };
 use rustc_hir::lang_items::{LangItem, LanguageItems};
-use rustc_hir::{Crate, ItemLocalId, ItemLocalMap, TraitCandidate};
+use rustc_hir::{Crate, ItemLocalId, ItemLocalMap, PreciseCapturingArgKind, TraitCandidate};
 use rustc_index::IndexVec;
 use rustc_lint_defs::LintId;
 use rustc_macros::rustc_queries;
@@ -1424,7 +1424,7 @@ rustc_queries! {
     }
 
     /// Gets the rendered precise capturing args for an opaque for use in rustdoc.
-    query rendered_precise_capturing_args(def_id: DefId) -> Option<&'tcx [Symbol]> {
+    query rendered_precise_capturing_args(def_id: DefId) -> Option<&'tcx [PreciseCapturingArgKind<Symbol, Symbol>]> {
         desc { |tcx| "rendering precise capturing args for `{}`", tcx.def_path_str(def_id) }
         separate_provide_extern
     }
diff --git a/compiler/rustc_middle/src/ty/parameterized.rs b/compiler/rustc_middle/src/ty/parameterized.rs
index 71fc38cb7ed..19e2b574563 100644
--- a/compiler/rustc_middle/src/ty/parameterized.rs
+++ b/compiler/rustc_middle/src/ty/parameterized.rs
@@ -3,6 +3,7 @@ use std::hash::Hash;
 use rustc_data_structures::unord::UnordMap;
 use rustc_hir::def_id::DefIndex;
 use rustc_index::{Idx, IndexVec};
+use rustc_span::Symbol;
 
 use crate::ty;
 
@@ -96,6 +97,7 @@ trivially_parameterized_over_tcx! {
     rustc_hir::def_id::DefIndex,
     rustc_hir::definitions::DefKey,
     rustc_hir::OpaqueTyOrigin<rustc_hir::def_id::DefId>,
+    rustc_hir::PreciseCapturingArgKind<Symbol, Symbol>,
     rustc_index::bit_set::DenseBitSet<u32>,
     rustc_index::bit_set::FiniteBitSet<u32>,
     rustc_session::cstore::ForeignModule,