From 20f759fdcebca91d4a425996894a2818d9452925 Mon Sep 17 00:00:00 2001
From: Oliver Schneider <github35764891676564198441@oli-obk.de>
Date: Fri, 8 Jun 2018 11:09:05 +0200
Subject: [PATCH] Fix rustdoc

---
 src/librustdoc/clean/mod.rs | 9 ++++++++-
 src/librustdoc/visit_ast.rs | 3 +++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 751a414e3c7c..4f36eee91013 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -2897,7 +2897,14 @@ impl Clean<Type> for hir::Ty {
                 }
             }
             TyBareFn(ref barefn) => BareFunction(box barefn.clean(cx)),
-            TyImplTraitExistential(ref exist_ty, _, _) => ImplTrait(exist_ty.bounds.clean(cx)),
+            TyImplTraitExistential(hir_id, _, _) => {
+                match cx.tcx.hir.expect_item(hir_id.id).node {
+                    hir::ItemExistential(ref exist_ty) => {
+                        ImplTrait(exist_ty.bounds.clean(cx))
+                    },
+                    ref other => panic!("impl Trait pointed to {:#?}", other),
+                }
+            },
             TyInfer | TyErr => Infer,
             TyTypeof(..) => panic!("Unimplemented type {:?}", self.node),
         }
diff --git a/src/librustdoc/visit_ast.rs b/src/librustdoc/visit_ast.rs
index 8c2555c4b3de..f0b687b9554a 100644
--- a/src/librustdoc/visit_ast.rs
+++ b/src/librustdoc/visit_ast.rs
@@ -559,6 +559,9 @@ impl<'a, 'tcx, 'rcx> RustdocVisitor<'a, 'tcx, 'rcx> {
                     om.impls.push(i);
                 }
             },
+            hir::ItemExistential(_) => {
+                // FIXME(oli-obk): actually generate docs for real existential items
+            }
         }
     }