Rollup merge of rust-lang#52835 - GuillaumeGomez:ice-rustdoc-links, r=eddyb

Fix Alias intra doc ICE

Fixes rust-lang#52611.

cc @QuietMisdreavus

r? @varkor

Author: Mark-Simulacrum

src/librustdoc/clean/mod.rs

@@ -1194,7 +1194,8 @@ fn resolve(cx: &DocContext, path_str: &str, is_val: bool) -> Result<(Def, Option
         })?;
         match ty.def {
             Def::Struct(did) | Def::Union(did) | Def::Enum(did) | Def::TyAlias(did) => {
-                let item = cx.tcx.inherent_impls(did).iter()
+                let item = cx.tcx.inherent_impls(did)
+                                 .iter()
                                  .flat_map(|imp| cx.tcx.associated_items(*imp))
                                  .find(|item| item.ident.name == item_name);
                 if let Some(item) = item {
@@ -1205,26 +1206,29 @@ fn resolve(cx: &DocContext, path_str: &str, is_val: bool) -> Result<(Def, Option
                     };
                     Ok((ty.def, Some(format!("{}.{}", out, item_name))))
                 } else {
-                    let is_enum = match ty.def {
-                        Def::Enum(_) => true,
-                        _ => false,
-                    };
-                    let elem = if is_enum {
-                        cx.tcx.adt_def(did).all_fields().find(|item| item.ident.name == item_name)
-                    } else {
-                        cx.tcx.adt_def(did)
-                              .non_enum_variant()
-                              .fields
-                              .iter()
-                              .find(|item| item.ident.name == item_name)
-                    };
-                    if let Some(item) = elem {
-                        Ok((ty.def,
-                            Some(format!("{}.{}",
-                                         if is_enum { "variant" } else { "structfield" },
-                                         item.ident))))
-                    } else {
-                        Err(())
+                    match cx.tcx.type_of(did).sty {
+                        ty::TyAdt(def, _) => {
+                            if let Some(item) = if def.is_enum() {
+                                def.all_fields().find(|item| item.ident.name == item_name)
+                            } else {
+                                def.non_enum_variant()
+                                   .fields
+                                   .iter()
+                                   .find(|item| item.ident.name == item_name)
+                            } {
+                                Ok((ty.def,
+                                    Some(format!("{}.{}",
+                                                 if def.is_enum() {
+                                                     "variant"
+                                                 } else {
+                                                     "structfield"
+                                                 },
+                                                 item.ident))))
+                            } else {
+                                Err(())
+                            }
+                        }
+                        _ => Err(()),
                     }
                 }
             }

src/librustdoc/visit_ast.rs

@@ -105,8 +105,8 @@ impl<'a, 'tcx, 'rcx> RustdocVisitor<'a, 'tcx, 'rcx> {
     }
 
     pub fn visit_variant_data(&mut self, item: &hir::Item,
-                            name: ast::Name, sd: &hir::VariantData,
-                            generics: &hir::Generics) -> Struct {
+                              name: ast::Name, sd: &hir::VariantData,
+                              generics: &hir::Generics) -> Struct {
         debug!("Visiting struct");
         let struct_type = struct_type_from_def(&*sd);
         Struct {

src/test/rustdoc-ui/intra-doc-alias-ice.rs

@@ -0,0 +1,16 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![deny(intra_doc_link_resolution_failure)]
+
+pub type TypeAlias = usize;
+
+/// [broken cross-reference](TypeAlias::hoge) //~ ERROR
+pub fn some_public_item() {}

src/test/rustdoc-ui/intra-doc-alias-ice.stderr

@@ -0,0 +1,13 @@
+error: `[TypeAlias::hoge]` cannot be resolved, ignoring it...
+  --> $DIR/intra-doc-alias-ice.rs:15:30
+   |
+15 | /// [broken cross-reference](TypeAlias::hoge) //~ ERROR
+   |                              ^^^^^^^^^^^^^^^ cannot be resolved, ignoring
+   |
+note: lint level defined here
+  --> $DIR/intra-doc-alias-ice.rs:11:9
+   |
+11 | #![deny(intra_doc_link_resolution_failure)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = help: to escape `[` and `]` characters, just add '/' before them like `/[` or `/]`
+