Auto merge of #50326 - ollie27:rustdoc_cross_crate_const_link, r=GuillaumeGomez

rustdoc: Fix links to constants in external crates

r? @GuillaumeGomez

src/librustdoc/clean/mod.rs

@@ -3881,6 +3881,7 @@ fn register_def(cx: &DocContext, def: Def) -> DefId {
         Def::Union(i) => (i, TypeKind::Union),
         Def::Mod(i) => (i, TypeKind::Module),
         Def::TyForeign(i) => (i, TypeKind::Foreign),
+        Def::Const(i) => (i, TypeKind::Const),
         Def::Static(i, _) => (i, TypeKind::Static),
         Def::Variant(i) => (cx.tcx.parent_def_id(i).unwrap(), TypeKind::Enum),
         Def::Macro(i, _) => (i, TypeKind::Macro),

src/test/rustdoc/auxiliary/all-item-types.rs

@@ -0,0 +1,32 @@
+// 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.
+
+#![feature(extern_types)]
+
+pub mod foo_mod {}
+extern "C" {
+    pub fn foo_ffn();
+    pub static FOO_FSTATIC: FooStruct;
+    pub type FooFType;
+}
+pub fn foo_fn() {}
+pub trait FooTrait {}
+pub struct FooStruct;
+pub enum FooEnum {}
+pub union FooUnion {
+    x: (),
+}
+pub type FooType = FooStruct;
+pub static FOO_STATIC: FooStruct = FooStruct;
+pub const FOO_CONSTANT: FooStruct = FooStruct;
+#[macro_export]
+macro_rules! foo_macro {
+    () => ();
+}

src/test/rustdoc/cross-crate-links.rs

@@ -0,0 +1,71 @@
+// 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.
+
+// aux-build:all-item-types.rs
+// build-aux-docs
+
+#![feature(use_extern_macros)]
+
+#![crate_name = "foo"]
+
+#[macro_use]
+extern crate all_item_types;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/foo_mod/index.html"]' 'foo_mod'
+#[doc(no_inline)]
+pub use all_item_types::foo_mod;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/fn.foo_ffn.html"]' 'foo_ffn'
+#[doc(no_inline)]
+pub use all_item_types::foo_ffn;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/static.FOO_FSTATIC.html"]' 'FOO_FSTATIC'
+#[doc(no_inline)]
+pub use all_item_types::FOO_FSTATIC;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/foreigntype.FooFType.html"]' 'FooFType'
+#[doc(no_inline)]
+pub use all_item_types::FooFType;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/fn.foo_fn.html"]' 'foo_fn'
+#[doc(no_inline)]
+pub use all_item_types::foo_fn;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/trait.FooTrait.html"]' 'FooTrait'
+#[doc(no_inline)]
+pub use all_item_types::FooTrait;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/struct.FooStruct.html"]' 'FooStruct'
+#[doc(no_inline)]
+pub use all_item_types::FooStruct;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/enum.FooEnum.html"]' 'FooEnum'
+#[doc(no_inline)]
+pub use all_item_types::FooEnum;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/union.FooUnion.html"]' 'FooUnion'
+#[doc(no_inline)]
+pub use all_item_types::FooUnion;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/type.FooType.html"]' 'FooType'
+#[doc(no_inline)]
+pub use all_item_types::FooType;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/static.FOO_STATIC.html"]' 'FOO_STATIC'
+#[doc(no_inline)]
+pub use all_item_types::FOO_STATIC;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/constant.FOO_CONSTANT.html"]' 'FOO_CONSTANT'
+#[doc(no_inline)]
+pub use all_item_types::FOO_CONSTANT;
+
+// @has 'foo/index.html' '//a[@href="../all_item_types/macro.foo_macro.html"]' 'foo_macro'
+#[doc(no_inline)]
+pub use all_item_types::foo_macro;