Auto merge of #47528 - GuillaumeGomez:rollup, r=GuillaumeGomez

Rollup of 6 pull requests

- Successful merges: #47250, #47313, #47398, #47468, #47471, #47520
- Failed merges:

src/bootstrap/builder.rs

@@ -254,7 +254,9 @@ impl<'a> Builder<'a> {
             Kind::Test => describe!(check::Tidy, check::Bootstrap, check::DefaultCompiletest,
                 check::HostCompiletest, check::Crate, check::CrateLibrustc, check::Rustdoc,
                 check::Linkcheck, check::Cargotest, check::Cargo, check::Rls, check::Docs,
-                check::ErrorIndex, check::Distcheck, check::Rustfmt, check::Miri, check::Clippy),
+                check::ErrorIndex, check::Distcheck, check::Rustfmt, check::Miri, check::Clippy,
+                check::RustdocJS),
+
             Kind::Bench => describe!(check::Crate, check::CrateLibrustc),
             Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
                 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,
@@ -443,7 +445,8 @@ impl<'a> Builder<'a> {
         let out_dir = self.stage_out(compiler, mode);
         cargo.env("CARGO_TARGET_DIR", out_dir)
              .arg(cmd)
-             .arg("--target").arg(target);
+             .arg("--target")
+             .arg(target);
 
         // If we were invoked from `make` then that's already got a jobserver
         // set up for us so no need to tell Cargo about jobs all over again.

src/bootstrap/check.rs

@@ -424,6 +424,43 @@ fn path_for_cargo(builder: &Builder, compiler: Compiler) -> OsString {
     env::join_paths(iter::once(path).chain(env::split_paths(&old_path))).expect("")
 }
 
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+pub struct RustdocJS {
+    pub host: Interned<String>,
+    pub target: Interned<String>,
+}
+
+impl Step for RustdocJS {
+    type Output = ();
+    const DEFAULT: bool = true;
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun) -> ShouldRun {
+        run.path("src/test/rustdoc-js")
+    }
+
+    fn make_run(run: RunConfig) {
+        run.builder.ensure(RustdocJS {
+            host: run.host,
+            target: run.target,
+        });
+    }
+
+    fn run(self, builder: &Builder) {
+        if let Some(ref nodejs) = builder.config.nodejs {
+            let mut command = Command::new(nodejs);
+            command.args(&["src/tools/rustdoc-js/tester.js", &*self.host]);
+            builder.ensure(::doc::Std {
+                target: self.target,
+                stage: builder.top_stage,
+            });
+            builder.run(&mut command);
+        } else {
+            println!("No nodejs found, skipping \"src/test/rustdoc-js\" tests");
+        }
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Tidy {
     host: Interned<String>,

src/bootstrap/doc.rs

@@ -419,8 +419,8 @@ impl Step for Standalone {
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Std {
-    stage: u32,
-    target: Interned<String>,
+    pub stage: u32,
+    pub target: Interned<String>,
 }
 
 impl Step for Std {

src/librustc/traits/error_reporting.rs

@@ -1241,7 +1241,13 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
             }
             ObligationCauseCode::ItemObligation(item_def_id) => {
                 let item_name = tcx.item_path_str(item_def_id);
-                err.note(&format!("required by `{}`", item_name));
+                let msg = format!("required by `{}`", item_name);
+                if let Some(sp) = tcx.hir.span_if_local(item_def_id) {
+                    let sp = tcx.sess.codemap().def_span(sp);
+                    err.span_note(sp, &msg);
+                } else {
+                    err.note(&msg);
+                }
             }
             ObligationCauseCode::ObjectCastObligation(object_ty) => {
                 err.note(&format!("required for the cast to the object type `{}`",

src/librustc_borrowck/borrowck/mod.rs

@@ -842,10 +842,32 @@ impl<'a, 'tcx> BorrowckCtxt<'a, 'tcx> {
                         if let mc::NoteClosureEnv(upvar_id) = err.cmt.note {
                             let node_id = self.tcx.hir.hir_to_node_id(upvar_id.var_id);
                             let sp = self.tcx.hir.span(node_id);
-                            match self.tcx.sess.codemap().span_to_snippet(sp) {
-                                Ok(snippet) => {
+                            let fn_closure_msg = "`Fn` closures cannot capture their enclosing \
+                                                  environment for modifications";
+                            match (self.tcx.sess.codemap().span_to_snippet(sp), &err.cmt.cat) {
+                                (_, &Categorization::Upvar(mc::Upvar {
+                                    kind: ty::ClosureKind::Fn, ..
+                                })) => {
+                                    db.note(fn_closure_msg);
+                                    // we should point at the cause for this closure being
+                                    // identified as `Fn` (like in signature of method this
+                                    // closure was passed into)
+                                }
+                                (Ok(ref snippet), ref cat) => {
                                     let msg = &format!("consider making `{}` mutable", snippet);
-                                    db.span_suggestion(sp, msg, format!("mut {}", snippet));
+                                    let suggestion = format!("mut {}", snippet);
+
+                                    if let &Categorization::Deref(ref cmt, _) = cat {
+                                        if let Categorization::Upvar(mc::Upvar {
+                                            kind: ty::ClosureKind::Fn, ..
+                                        }) = cmt.cat {
+                                            db.note(fn_closure_msg);
+                                        } else {
+                                            db.span_suggestion(sp, msg, suggestion);
+                                        }
+                                    } else {
+                                        db.span_suggestion(sp, msg, suggestion);
+                                    }
                                 }
                                 _ => {
                                     db.span_help(sp, "consider making this binding mutable");

src/librustdoc/clean/inline.rs

@@ -328,6 +328,9 @@ pub fn build_impl(cx: &DocContext, did: DefId, ret: &mut Vec<clean::Item>) {
     if trait_.def_id() == tcx.lang_items().deref_trait() {
         super::build_deref_target_impls(cx, &trait_items, ret);
     }
+    if let Some(trait_did) = trait_.def_id() {
+        record_extern_trait(cx, trait_did);
+    }
 
     let provided = trait_.def_id().map(|did| {
         tcx.provided_trait_methods(did)
@@ -483,3 +486,9 @@ fn separate_supertrait_bounds(mut g: clean::Generics)
     });
     (g, ty_bounds)
 }
+
+pub fn record_extern_trait(cx: &DocContext, did: DefId) {
+    cx.external_traits.borrow_mut().entry(did).or_insert_with(|| {
+        build_external_trait(cx, did)
+    });
+}

src/librustdoc/clean/mod.rs

@@ -3163,8 +3163,7 @@ fn register_def(cx: &DocContext, def: Def) -> DefId {
     if did.is_local() { return did }
     inline::record_extern_fqn(cx, did, kind);
     if let TypeKind::Trait = kind {
-        let t = inline::build_external_trait(cx, did);
-        cx.external_traits.borrow_mut().insert(did, t);
+        inline::record_extern_trait(cx, did);
     }
     did
 }

src/librustdoc/html/render.rs

@@ -3277,8 +3277,7 @@ fn spotlight_decl(decl: &clean::FnDecl) -> Result<String, fmt::Error> {
         if let Some(impls) = c.impls.get(&did) {
             for i in impls {
                 let impl_ = i.inner_impl();
-                if impl_.trait_.def_id().and_then(|d| c.traits.get(&d))
-                                        .map_or(false, |t| t.is_spotlight) {
+                if impl_.trait_.def_id().map_or(false, |d| c.traits[&d].is_spotlight) {
                     if out.is_empty() {
                         out.push_str(
                             &format!("<h3 class=\"important\">Important traits for {}</h3>\
@@ -3444,7 +3443,7 @@ fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLi
     }
 
     let traits = &cache().traits;
-    let trait_ = i.trait_did().and_then(|did| traits.get(&did));
+    let trait_ = i.trait_did().map(|did| &traits[&did]);
 
     if !show_def_docs {
         write!(w, "<span class='docblock autohide'>")?;

src/librustdoc/html/static/main.js

@@ -353,35 +353,33 @@
      * This code is an unmodified version of the code written by Marco de Wit
      * and was found at http://stackoverflow.com/a/18514751/745719
      */
-    var levenshtein = (function() {
-        var row2 = [];
-        return function(s1, s2) {
-            if (s1 === s2) {
-                return 0;
+    var levenshtein_row2 = [];
+    function levenshtein(s1, s2) {
+        if (s1 === s2) {
+            return 0;
+        }
+        var s1_len = s1.length, s2_len = s2.length;
+        if (s1_len && s2_len) {
+            var i1 = 0, i2 = 0, a, b, c, c2, row = levenshtein_row2;
+            while (i1 < s1_len) {
+                row[i1] = ++i1;
             }
-            var s1_len = s1.length, s2_len = s2.length;
-            if (s1_len && s2_len) {
-                var i1 = 0, i2 = 0, a, b, c, c2, row = row2;
-                while (i1 < s1_len) {
-                    row[i1] = ++i1;
-                }
-                while (i2 < s2_len) {
-                    c2 = s2.charCodeAt(i2);
-                    a = i2;
-                    ++i2;
-                    b = i2;
-                    for (i1 = 0; i1 < s1_len; ++i1) {
-                        c = a + (s1.charCodeAt(i1) !== c2 ? 1 : 0);
-                        a = row[i1];
-                        b = b < a ? (b < c ? b + 1 : c) : (a < c ? a + 1 : c);
-                        row[i1] = b;
-                    }
+            while (i2 < s2_len) {
+                c2 = s2.charCodeAt(i2);
+                a = i2;
+                ++i2;
+                b = i2;
+                for (i1 = 0; i1 < s1_len; ++i1) {
+                    c = a + (s1.charCodeAt(i1) !== c2 ? 1 : 0);
+                    a = row[i1];
+                    b = b < a ? (b < c ? b + 1 : c) : (a < c ? a + 1 : c);
+                    row[i1] = b;
                 }
-                return b;
             }
-            return s1_len + s2_len;
-        };
-    })();
+            return b;
+        }
+        return s1_len + s2_len;
+    }
 
     function initSearch(rawSearchIndex) {
         var currentResults, index, searchIndex;
@@ -400,12 +398,20 @@
         /**
          * Executes the query and builds an index of results
          * @param  {[Object]} query     [The user query]
-         * @param  {[type]} max         [The maximum results returned]
          * @param  {[type]} searchWords [The list of search words to query
          *                               against]
          * @return {[type]}             [A search index of results]
          */
-        function execQuery(query, max, searchWords) {
+        function execQuery(query, searchWords) {
+            function itemTypeFromName(typename) {
+                for (var i = 0; i < itemTypes.length; ++i) {
+                    if (itemTypes[i] === typename) {
+                        return i;
+                    }
+                }
+                return -1;
+            }
+
             var valLower = query.query.toLowerCase(),
                 val = valLower,
                 typeFilter = itemTypeFromName(query.type),
@@ -1021,9 +1027,8 @@
             return true;
         }
 
-        function getQuery() {
-            var matches, type, query, raw =
-                document.getElementsByClassName('search-input')[0].value;
+        function getQuery(raw) {
+            var matches, type, query;
             query = raw;
 
             matches = query.match(/^(fn|mod|struct|enum|trait|type|const|macro)\s*:\s*/i);
@@ -1227,7 +1232,7 @@
         }
 
         function showResults(results) {
-            var output, query = getQuery();
+            var output, query = getQuery(document.getElementsByClassName('search-input')[0].value);
 
             currentResults = query.id;
             output = '<h1>Results for ' + escape(query.query) +
@@ -1271,7 +1276,7 @@
                 resultIndex;
             var params = getQueryStringParams();
 
-            query = getQuery();
+            query = getQuery(document.getElementsByClassName('search-input')[0].value);
             if (e) {
                 e.preventDefault();
             }
@@ -1293,19 +1298,10 @@
                 }
             }
 
-            results = execQuery(query, 20000, index);
+            results = execQuery(query, index);
             showResults(results);
         }
 
-        function itemTypeFromName(typename) {
-            for (var i = 0; i < itemTypes.length; ++i) {
-                if (itemTypes[i] === typename) {
-                    return i;
-                }
-            }
-            return -1;
-        }
-
         function buildIndex(rawSearchIndex) {
             searchIndex = [];
             var searchWords = [];

src/librustdoc/lib.rs

@@ -242,8 +242,8 @@ pub fn opts() -> Vec<RustcOptGroup> {
                       or `#![doc(html_playground_url=...)]`",
                      "URL")
         }),
-        unstable("enable-commonmark", |o| {
-            o.optflag("", "enable-commonmark", "to enable commonmark doc rendering/testing")
+        unstable("disable-commonmark", |o| {
+            o.optflag("", "disable-commonmark", "to disable commonmark doc rendering/testing")
         }),
         unstable("display-warnings", |o| {
             o.optflag("", "display-warnings", "to print code warnings when testing doc")
@@ -347,10 +347,10 @@ pub fn main_args(args: &[String]) -> isize {
     let css_file_extension = matches.opt_str("e").map(|s| PathBuf::from(&s));
     let cfgs = matches.opt_strs("cfg");
 
-    let render_type = if matches.opt_present("enable-commonmark") {
-        RenderType::Pulldown
-    } else {
+    let render_type = if matches.opt_present("disable-commonmark") {
         RenderType::Hoedown
+    } else {
+        RenderType::Pulldown
     };
 
     if let Some(ref p) = css_file_extension {

src/libstd/fs.rs

@@ -211,12 +211,12 @@ pub struct DirBuilder {
     recursive: bool,
 }
 
-/// How large a buffer to pre-allocate before reading the entire file at `path`.
-fn initial_buffer_size<P: AsRef<Path>>(path: P) -> usize {
+/// How large a buffer to pre-allocate before reading the entire file.
+fn initial_buffer_size(file: &File) -> usize {
     // Allocate one extra byte so the buffer doesn't need to grow before the
     // final `read` call at the end of the file.  Don't worry about `usize`
     // overflow because reading will fail regardless in that case.
-    metadata(path).map(|m| m.len() as usize + 1).unwrap_or(0)
+    file.metadata().map(|m| m.len() as usize + 1).unwrap_or(0)
 }
 
 /// Read the entire contents of a file into a bytes vector.
@@ -254,8 +254,9 @@ fn initial_buffer_size<P: AsRef<Path>>(path: P) -> usize {
 /// ```
 #[unstable(feature = "fs_read_write", issue = "46588")]
 pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
-    let mut bytes = Vec::with_capacity(initial_buffer_size(&path));
-    File::open(path)?.read_to_end(&mut bytes)?;
+    let mut file = File::open(path)?;
+    let mut bytes = Vec::with_capacity(initial_buffer_size(&file));
+    file.read_to_end(&mut bytes)?;
     Ok(bytes)
 }
 
@@ -295,8 +296,9 @@ pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
 /// ```
 #[unstable(feature = "fs_read_write", issue = "46588")]
 pub fn read_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
-    let mut string = String::with_capacity(initial_buffer_size(&path));
-    File::open(path)?.read_to_string(&mut string)?;
+    let mut file = File::open(path)?;
+    let mut string = String::with_capacity(initial_buffer_size(&file));
+    file.read_to_string(&mut string)?;
     Ok(string)
 }