diff --git a/tests/rustdoc-js/auxiliary/interner.rs b/tests/rustdoc-js/auxiliary/interner.rs
new file mode 100644
index 00000000000..c95029be9f0
--- /dev/null
+++ b/tests/rustdoc-js/auxiliary/interner.rs
@@ -0,0 +1,245 @@
+#![feature(associated_type_defaults)]
+
+use std::cmp::Ord;
+use std::fmt::{Debug, Formatter};
+use std::hash::Hash;
+use std::ops::ControlFlow;
+
+pub trait Interner: Sized {
+    type DefId: Copy + Debug + Hash + Ord;
+    type AdtDef: Copy + Debug + Hash + Ord;
+    type GenericArgs: Copy
+        + DebugWithInfcx<Self>
+        + Hash
+        + Ord
+        + IntoIterator<Item = Self::GenericArg>;
+    type GenericArg: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type Term: Copy + Debug + Hash + Ord;
+    type Binder<T: TypeVisitable<Self>>: BoundVars<Self> + TypeSuperVisitable<Self>;
+    type BoundVars: IntoIterator<Item = Self::BoundVar>;
+    type BoundVar;
+    type CanonicalVars: Copy + Debug + Hash + Eq + IntoIterator<Item = CanonicalVarInfo<Self>>;
+    type Ty: Copy
+        + DebugWithInfcx<Self>
+        + Hash
+        + Ord
+        + Into<Self::GenericArg>
+        + IntoKind<Kind = TyKind<Self>>
+        + TypeSuperVisitable<Self>
+        + Flags
+        + Ty<Self>;
+    type Tys: Copy + Debug + Hash + Ord + IntoIterator<Item = Self::Ty>;
+    type AliasTy: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type ParamTy: Copy + Debug + Hash + Ord;
+    type BoundTy: Copy + Debug + Hash + Ord;
+    type PlaceholderTy: Copy + Debug + Hash + Ord + PlaceholderLike;
+    type ErrorGuaranteed: Copy + Debug + Hash + Ord;
+    type BoundExistentialPredicates: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type PolyFnSig: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type AllocId: Copy + Debug + Hash + Ord;
+    type Const: Copy
+        + DebugWithInfcx<Self>
+        + Hash
+        + Ord
+        + Into<Self::GenericArg>
+        + IntoKind<Kind = ConstKind<Self>>
+        + ConstTy<Self>
+        + TypeSuperVisitable<Self>
+        + Flags
+        + Const<Self>;
+    type AliasConst: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type PlaceholderConst: Copy + Debug + Hash + Ord + PlaceholderLike;
+    type ParamConst: Copy + Debug + Hash + Ord;
+    type BoundConst: Copy + Debug + Hash + Ord;
+    type ValueConst: Copy + Debug + Hash + Ord;
+    type ExprConst: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type Region: Copy
+        + DebugWithInfcx<Self>
+        + Hash
+        + Ord
+        + Into<Self::GenericArg>
+        + IntoKind<Kind = RegionKind<Self>>
+        + Flags
+        + Region<Self>;
+    type EarlyParamRegion: Copy + Debug + Hash + Ord;
+    type LateParamRegion: Copy + Debug + Hash + Ord;
+    type BoundRegion: Copy + Debug + Hash + Ord;
+    type InferRegion: Copy + DebugWithInfcx<Self> + Hash + Ord;
+    type PlaceholderRegion: Copy + Debug + Hash + Ord + PlaceholderLike;
+    type Predicate: Copy + Debug + Hash + Eq + TypeSuperVisitable<Self> + Flags;
+    type TraitPredicate: Copy + Debug + Hash + Eq;
+    type RegionOutlivesPredicate: Copy + Debug + Hash + Eq;
+    type TypeOutlivesPredicate: Copy + Debug + Hash + Eq;
+    type ProjectionPredicate: Copy + Debug + Hash + Eq;
+    type NormalizesTo: Copy + Debug + Hash + Eq;
+    type SubtypePredicate: Copy + Debug + Hash + Eq;
+    type CoercePredicate: Copy + Debug + Hash + Eq;
+    type ClosureKind: Copy + Debug + Hash + Eq;
+
+    // Required method
+    fn mk_canonical_var_infos(
+        self,
+        infos: &[CanonicalVarInfo<Self>]
+    ) -> Self::CanonicalVars;
+}
+
+pub trait DebugWithInfcx<I: Interner>: Debug {
+    // Required method
+    fn fmt<Infcx: InferCtxtLike<Interner = I>>(
+        this: WithInfcx<'_, Infcx, &Self>,
+        f: &mut Formatter<'_>
+    ) -> std::fmt::Result;
+}
+
+pub trait TypeVisitable<I: Interner>: Debug + Clone {
+    // Required method
+    fn visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> V::Result;
+}
+
+pub trait BoundVars<I: Interner> {
+    // Required methods
+    fn bound_vars(&self) -> I::BoundVars;
+    fn has_no_bound_vars(&self) -> bool;
+}
+
+pub trait TypeSuperVisitable<I: Interner>: TypeVisitable<I> {
+    // Required method
+    fn super_visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> V::Result;
+}
+
+pub struct CanonicalVarInfo<I: Interner> {
+    pub kind: CanonicalVarKind<I>,
+}
+
+pub struct CanonicalVarKind<I>(std::marker::PhantomData<I>);
+
+pub struct TyKind<I>(std::marker::PhantomData<I>);
+
+pub trait IntoKind {
+    type Kind;
+
+    // Required method
+    fn kind(self) -> Self::Kind;
+}
+pub trait Flags {
+    // Required methods
+    fn flags(&self) -> TypeFlags;
+    fn outer_exclusive_binder(&self) -> DebruijnIndex;
+}
+pub struct TypeFlags;
+
+pub trait Ty<I: Interner<Ty = Self>> {
+    // Required method
+    fn new_anon_bound(
+        interner: I,
+        debruijn: DebruijnIndex,
+        var: BoundVar
+    ) -> Self;
+}
+
+pub trait PlaceholderLike {
+    // Required methods
+    fn universe(self) -> UniverseIndex;
+    fn var(self) -> BoundVar;
+    fn with_updated_universe(self, ui: UniverseIndex) -> Self;
+    fn new(ui: UniverseIndex, var: BoundVar) -> Self;
+}
+
+pub struct UniverseIndex;
+
+pub struct BoundVar;
+
+pub struct ConstKind<I>(std::marker::PhantomData<I>);
+pub trait Const<I: Interner<Const = Self>> {
+    // Required method
+    fn new_anon_bound(
+        interner: I,
+        debruijn: DebruijnIndex,
+        var: BoundVar,
+        ty: I::Ty
+    ) -> Self;
+}
+
+pub trait ConstTy<I: Interner> {
+    // Required method
+    fn ty(self) -> I::Ty;
+}
+
+pub struct DebruijnIndex;
+
+pub struct RegionKind<I>(std::marker::PhantomData<I>);
+pub trait Region<I: Interner<Region = Self>> {
+    // Required method
+    fn new_anon_bound(
+        interner: I,
+        debruijn: DebruijnIndex,
+        var: BoundVar
+    ) -> Self;
+}
+
+pub trait TypeVisitor<I: Interner>: Sized {
+    type Result: VisitorResult = ();
+
+    // Provided methods
+    fn visit_binder<T: TypeVisitable<I>>(
+        &mut self,
+        t: &I::Binder<T>
+    ) -> Self::Result { unimplemented!() }
+    fn visit_ty(&mut self, t: I::Ty) -> Self::Result { unimplemented!() }
+    fn visit_region(&mut self, _r: I::Region) -> Self::Result { unimplemented!() }
+    fn visit_const(&mut self, c: I::Const) -> Self::Result { unimplemented!() }
+    fn visit_predicate(&mut self, p: I::Predicate) -> Self::Result { unimplemented!() }
+}
+
+pub trait VisitorResult {
+    type Residual;
+
+    // Required methods
+    fn output() -> Self;
+    fn from_residual(residual: Self::Residual) -> Self;
+    fn from_branch(b: ControlFlow<Self::Residual>) -> Self;
+    fn branch(self) -> ControlFlow<Self::Residual>;
+}
+
+impl VisitorResult for () {
+    type Residual = ();
+    fn output() -> Self {}
+    fn from_residual(_: Self::Residual) -> Self {}
+    fn from_branch(_: ControlFlow<Self::Residual>) -> Self {}
+    fn branch(self) -> ControlFlow<Self::Residual> { ControlFlow::Continue(()) }
+}
+
+pub struct WithInfcx<'a, Infcx: InferCtxtLike, T> {
+    pub data: T,
+    pub infcx: &'a Infcx,
+}
+
+pub trait InferCtxtLike {
+    type Interner: Interner;
+
+    // Required methods
+    fn interner(&self) -> Self::Interner;
+    fn universe_of_ty(&self, ty: TyVid) -> Option<UniverseIndex>;
+    fn root_ty_var(&self, vid: TyVid) -> TyVid;
+    fn probe_ty_var(
+        &self,
+        vid: TyVid
+    ) -> Option<<Self::Interner as Interner>::Ty>;
+    fn universe_of_lt(
+        &self,
+        lt: <Self::Interner as Interner>::InferRegion
+    ) -> Option<UniverseIndex>;
+    fn opportunistic_resolve_lt_var(
+        &self,
+        vid: <Self::Interner as Interner>::InferRegion
+    ) -> Option<<Self::Interner as Interner>::Region>;
+    fn universe_of_ct(&self, ct: ConstVid) -> Option<UniverseIndex>;
+    fn root_ct_var(&self, vid: ConstVid) -> ConstVid;
+    fn probe_ct_var(
+        &self,
+        vid: ConstVid
+    ) -> Option<<Self::Interner as Interner>::Const>;
+}
+
+pub struct TyVid;
+pub struct ConstVid;
diff --git a/tests/rustdoc-js/looks-like-rustc-interner.js b/tests/rustdoc-js/looks-like-rustc-interner.js
new file mode 100644
index 00000000000..a4806d23499
--- /dev/null
+++ b/tests/rustdoc-js/looks-like-rustc-interner.js
@@ -0,0 +1,9 @@
+// https://github.com/rust-lang/rust/pull/122247
+// exact-check
+
+const EXPECTED = {
+    'query': 'canonicalvarinfo, intoiterator -> intoiterator',
+    'others': [
+        { 'path': 'looks_like_rustc_interner::Interner', 'name': 'mk_canonical_var_infos' },
+    ],
+};
diff --git a/tests/rustdoc-js/looks-like-rustc-interner.rs b/tests/rustdoc-js/looks-like-rustc-interner.rs
new file mode 100644
index 00000000000..f304e28d952
--- /dev/null
+++ b/tests/rustdoc-js/looks-like-rustc-interner.rs
@@ -0,0 +1,5 @@
+//@ aux-crate:interner=interner.rs
+// https://github.com/rust-lang/rust/pull/122247
+extern crate interner;
+#[doc(inline)]
+pub use interner::*;