Rollup merge of #42145 - ollie27:rustdoc_inline_renamed, r=steveklabnik

rustdoc: Fix names of items in cross crate reexported modules

For renamed reexports the new name should be used.

An example of this (as pointed out in #27741 (comment)) is two instances of `StepBy` in [`std::iter`](https://doc.rust-lang.org/nightly/std/iter/index.html#structs). [`core::iter`](https://doc.rust-lang.org/nightly/core/iter/index.html#structs) is correct.

Fixes #37608

Author: frewsxcv

src/librustdoc/clean/inline.rs

@@ -41,26 +41,11 @@ use super::Clean;
 ///
 /// The returned value is `None` if the definition could not be inlined,
 /// and `Some` of a vector of items if it was successfully expanded.
-pub fn try_inline(cx: &DocContext, def: Def, into: Option<ast::Name>)
+pub fn try_inline(cx: &DocContext, def: Def, name: ast::Name)
                   -> Option<Vec<clean::Item>> {
     if def == Def::Err { return None }
     let did = def.def_id();
     if did.is_local() { return None }
-    try_inline_def(cx, def).map(|vec| {
-        vec.into_iter().map(|mut item| {
-            match into {
-                Some(into) if item.name.is_some() => {
-                    item.name = Some(into.clean(cx));
-                }
-                _ => {}
-            }
-            item
-        }).collect()
-    })
-}
-
-fn try_inline_def(cx: &DocContext, def: Def) -> Option<Vec<clean::Item>> {
-    let tcx = cx.tcx;
     let mut ret = Vec::new();
     let inner = match def {
         Def::Trait(did) => {
@@ -112,16 +97,15 @@ fn try_inline_def(cx: &DocContext, def: Def) -> Option<Vec<clean::Item>> {
         }
         _ => return None,
     };
-    let did = def.def_id();
     cx.renderinfo.borrow_mut().inlined.insert(did);
     ret.push(clean::Item {
-        source: tcx.def_span(did).clean(cx),
-        name: Some(tcx.item_name(did).to_string()),
+        source: cx.tcx.def_span(did).clean(cx),
+        name: Some(name.clean(cx)),
         attrs: load_attrs(cx, did),
         inner: inner,
         visibility: Some(clean::Public),
-        stability: tcx.lookup_stability(did).clean(cx),
-        deprecation: tcx.lookup_deprecation(did).clean(cx),
+        stability: cx.tcx.lookup_stability(did).clean(cx),
+        deprecation: cx.tcx.lookup_deprecation(did).clean(cx),
         def_id: did,
     });
     Some(ret)
@@ -463,7 +447,7 @@ fn build_module(cx: &DocContext, did: DefId) -> clean::Module {
             let def_id = item.def.def_id();
             if cx.tcx.sess.cstore.visibility(def_id) == ty::Visibility::Public {
                 if !visited.insert(def_id) { continue }
-                if let Some(i) = try_inline_def(cx, item.def) {
+                if let Some(i) = try_inline(cx, item.def, item.name) {
                     items.extend(i)
                 }
             }

src/librustdoc/clean/mod.rs

@@ -2618,7 +2618,7 @@ impl Clean<Vec<Item>> for doctree::Import {
         } else {
             let name = self.name;
             if !denied {
-                if let Some(items) = inline::try_inline(cx, path.def, Some(name)) {
+                if let Some(items) = inline::try_inline(cx, path.def, name) {
                     return items;
                 }
             }

src/test/rustdoc/inline_cross/auxiliary/renamed-via-module.rs

@@ -0,0 +1,19 @@
+// Copyright 2017 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.
+
+#![crate_name = "foo"]
+
+pub mod iter {
+    mod range {
+        pub struct StepBy;
+    }
+    pub use self::range::StepBy as DeprecatedStepBy;
+    pub struct StepBy;
+}

src/test/rustdoc/inline_cross/renamed-via-module.rs

@@ -0,0 +1,34 @@
+// Copyright 2017 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:renamed-via-module.rs
+// build-aux-docs
+// ignore-cross-compile
+
+#![crate_name = "bar"]
+
+extern crate foo;
+
+// @has foo/iter/index.html
+// @has - '//a/[@href="struct.DeprecatedStepBy.html"]' "DeprecatedStepBy"
+// @has - '//a/[@href="struct.StepBy.html"]' "StepBy"
+// @has foo/iter/struct.DeprecatedStepBy.html
+// @has - '//h1' "Struct foo::iter::DeprecatedStepBy"
+// @has foo/iter/struct.StepBy.html
+// @has - '//h1' "Struct foo::iter::StepBy"
+
+// @has bar/iter/index.html
+// @has - '//a/[@href="struct.DeprecatedStepBy.html"]' "DeprecatedStepBy"
+// @has - '//a/[@href="struct.StepBy.html"]' "StepBy"
+// @has bar/iter/struct.DeprecatedStepBy.html
+// @has - '//h1' "Struct bar::iter::DeprecatedStepBy"
+// @has bar/iter/struct.StepBy.html
+// @has - '//h1' "Struct bar::iter::StepBy"
+pub use foo::iter;