diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index 3aad51325dc..7de594719dd 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -2096,9 +2096,6 @@ pub enum TyKind {
     Err,
     /// Placeholder for a `va_list`.
     CVarArgs,
-    /// Placeholder for "anonymous enums", which don't exist, but keeping their
-    /// information around lets us produce better diagnostics.
-    AnonEnum(Vec<P<Ty>>),
 }
 
 impl TyKind {
diff --git a/compiler/rustc_ast/src/mut_visit.rs b/compiler/rustc_ast/src/mut_visit.rs
index 894885cf0fe..77f342d1eb3 100644
--- a/compiler/rustc_ast/src/mut_visit.rs
+++ b/compiler/rustc_ast/src/mut_visit.rs
@@ -470,7 +470,7 @@ pub fn noop_visit_ty<T: MutVisitor>(ty: &mut P<Ty>, vis: &mut T) {
             vis.visit_fn_decl(decl);
             vis.visit_span(decl_span);
         }
-        TyKind::AnonEnum(tys) | TyKind::Tup(tys) => visit_vec(tys, |ty| vis.visit_ty(ty)),
+        TyKind::Tup(tys) => visit_vec(tys, |ty| vis.visit_ty(ty)),
         TyKind::Paren(ty) => vis.visit_ty(ty),
         TyKind::Path(qself, path) => {
             vis.visit_qself(qself);
diff --git a/compiler/rustc_ast/src/visit.rs b/compiler/rustc_ast/src/visit.rs
index 1ab70f0309c..feb5187536f 100644
--- a/compiler/rustc_ast/src/visit.rs
+++ b/compiler/rustc_ast/src/visit.rs
@@ -400,7 +400,7 @@ pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) {
             walk_list!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Ref);
             visitor.visit_ty(&mutable_type.ty)
         }
-        TyKind::AnonEnum(tys) | TyKind::Tup(tys) => {
+        TyKind::Tup(tys) => {
             walk_list!(visitor, visit_ty, tys);
         }
         TyKind::BareFn(function_declaration) => {
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index a60d02002da..41d4a5679f1 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -1235,7 +1235,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         let kind = match &t.kind {
             TyKind::Infer => hir::TyKind::Infer,
             TyKind::Err => hir::TyKind::Err,
-            TyKind::AnonEnum(_) => hir::TyKind::Err,
             TyKind::Slice(ty) => hir::TyKind::Slice(self.lower_ty(ty, itctx)),
             TyKind::Ptr(mt) => hir::TyKind::Ptr(self.lower_mt(mt, itctx)),
             TyKind::Ref(region, mt) => {
diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index 3f9b96a6158..6a8064b0e87 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -1041,9 +1041,6 @@ impl<'a> State<'a> {
                 }
                 self.pclose();
             }
-            ast::TyKind::AnonEnum(elts) => {
-                self.strsep("|", false, Inconsistent, elts, |s, ty| s.print_type(ty));
-            }
             ast::TyKind::Paren(typ) => {
                 self.popen();
                 self.print_type(typ);
diff --git a/compiler/rustc_parse/src/parser/ty.rs b/compiler/rustc_parse/src/parser/ty.rs
index 72994df6f9f..43e6eac438b 100644
--- a/compiler/rustc_parse/src/parser/ty.rs
+++ b/compiler/rustc_parse/src/parser/ty.rs
@@ -390,7 +390,7 @@ impl<'a> Parser<'a> {
                     .join("\n"),
             ));
             err.emit();
-            return Ok(self.mk_ty(lo.to(self.prev_token.span), TyKind::AnonEnum(types)));
+            return Ok(self.mk_ty(lo.to(self.prev_token.span), TyKind::Err));
         }
         if allow_qpath_recovery { self.maybe_recover_from_bad_qpath(ty) } else { Ok(ty) }
     }
diff --git a/compiler/rustc_passes/src/hir_stats.rs b/compiler/rustc_passes/src/hir_stats.rs
index 312bd8839e0..b86d2316820 100644
--- a/compiler/rustc_passes/src/hir_stats.rs
+++ b/compiler/rustc_passes/src/hir_stats.rs
@@ -579,7 +579,6 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
             [
                 Slice,
                 Array,
-                AnonEnum,
                 Ptr,
                 Ref,
                 BareFn,
diff --git a/src/tools/rustfmt/src/types.rs b/src/tools/rustfmt/src/types.rs
index f065ec680d7..c1991e8d2c8 100644
--- a/src/tools/rustfmt/src/types.rs
+++ b/src/tools/rustfmt/src/types.rs
@@ -839,9 +839,7 @@ impl Rewrite for ast::Ty {
                 })
             }
             ast::TyKind::CVarArgs => Some("...".to_owned()),
-            ast::TyKind::AnonEnum(_) | ast::TyKind::Err => {
-                Some(context.snippet(self.span).to_owned())
-            }
+            ast::TyKind::Err => Some(context.snippet(self.span).to_owned()),
             ast::TyKind::Typeof(ref anon_const) => rewrite_call(
                 context,
                 "typeof",