Auto merge of #33005 - Manishearth:rollup, r=Manishearth

Rollup of 11 pull requests

- Successful merges: #32923, #32926, #32929, #32931, #32935, #32945, #32946, #32964, #32970, #32973, #32997
- Failed merges:

Author: bors

src/bootstrap/bootstrap.py

@@ -10,6 +10,7 @@
 
 import argparse
 import contextlib
+import hashlib
 import os
 import shutil
 import subprocess
@@ -18,13 +19,29 @@
 
 def get(url, path, verbose=False):
     print("downloading " + url)
-    # see http://serverfault.com/questions/301128/how-to-download
-    if sys.platform == 'win32':
-        run(["PowerShell.exe", "/nologo", "-Command",
-             "(New-Object System.Net.WebClient).DownloadFile('" + url +
-                "', '" + path + "')"], verbose=verbose)
-    else:
-        run(["curl", "-o", path, url], verbose=verbose)
+    sha_url = url + ".sha256"
+    sha_path = path + ".sha256"
+    for _url, _path in ((url, path), (sha_url, sha_path)):
+        # see http://serverfault.com/questions/301128/how-to-download
+        if sys.platform == 'win32':
+            run(["PowerShell.exe", "/nologo", "-Command",
+                 "(New-Object System.Net.WebClient)"
+                 ".DownloadFile('{}', '{}')".format(_url, _path)],
+                verbose=verbose)
+        else:
+            run(["curl", "-o", _path, _url], verbose=verbose)
+    print("verifying " + path)
+    with open(path, "rb") as f:
+        found = hashlib.sha256(f.read()).hexdigest()
+    with open(sha_path, "r") as f:
+        expected, _ = f.readline().split()
+    if found != expected:
+        err = ("invalid checksum:\n"
+               "    found:    {}\n"
+               "    expected: {}".format(found, expected))
+        if verbose:
+            raise RuntimeError(err)
+        sys.exit(err)
 
 def unpack(tarball, dst, verbose=False, match=None):
     print("extracting " + tarball)
@@ -57,9 +74,10 @@ def run(args, verbose=False):
     ret = subprocess.Popen(args)
     code = ret.wait()
     if code != 0:
-        if not verbose:
-            print("failed to run: " + ' '.join(args))
-        raise RuntimeError("failed to run command")
+        err = "failed to run: " + ' '.join(args)
+        if verbose:
+            raise RuntimeError(err)
+        sys.exit(err)
 
 class RustBuild:
     def download_rust_nightly(self):
@@ -210,7 +228,10 @@ def build_triple(self):
             if sys.platform == 'win32':
                 return 'x86_64-pc-windows-msvc'
             else:
-                raise
+                err = "uname not found"
+                if self.verbose:
+                    raise Exception(err)
+                sys.exit(err)
 
         # Darwin's `uname -s` lies and always returns i386. We have to use
         # sysctl instead.
@@ -253,7 +274,10 @@ def build_triple(self):
                 cputype = 'x86_64'
             ostype = 'pc-windows-gnu'
         else:
-            raise ValueError("unknown OS type: " + ostype)
+            err = "unknown OS type: " + ostype
+            if self.verbose:
+                raise ValueError(err)
+            sys.exit(err)
 
         if cputype in {'i386', 'i486', 'i686', 'i786', 'x86'}:
             cputype = 'i686'
@@ -269,7 +293,10 @@ def build_triple(self):
         elif cputype in {'amd64', 'x86_64', 'x86-64', 'x64'}:
             cputype = 'x86_64'
         else:
-            raise ValueError("unknown cpu type: " + cputype)
+            err = "unknown cpu type: " + cputype
+            if self.verbose:
+                raise ValueError(err)
+            sys.exit(err)
 
         return cputype + '-' + ostype
 

src/doc/book/closures.md

@@ -492,12 +492,12 @@ fn factory() -> Box<Fn(i32) -> i32> {
 
     Box::new(move |x| x + num)
 }
-# fn main() {
+fn main() {
 let f = factory();
 
 let answer = f(1);
 assert_eq!(6, answer);
-# }
+}
 ```
 
 By making the inner closure a `move Fn`, we create a new stack frame for our

src/doc/book/getting-started.md

@@ -575,8 +575,12 @@ look something like this:
 name = "hello_world"
 version = "0.1.0"
 authors = ["Your Name <you@example.com>"]
+
+[dependencies]
 ```
 
+Do not worry about the `[dependencies]` line, we will come back to it later.
+
 Cargo has populated *Cargo.toml* with reasonable defaults based on the arguments
 you gave it and your `git` global configuration. You may notice that Cargo has
 also initialized the `hello_world` directory as a `git` repository.

src/liballoc_system/lib.rs

@@ -96,8 +96,10 @@ mod imp {
             libc::realloc(ptr as *mut libc::c_void, size as libc::size_t) as *mut u8
         } else {
             let new_ptr = allocate(size, align);
-            ptr::copy(ptr, new_ptr, cmp::min(size, old_size));
-            deallocate(ptr, old_size, align);
+            if !new_ptr.is_null() {
+                ptr::copy(ptr, new_ptr, cmp::min(size, old_size));
+                deallocate(ptr, old_size, align);
+            }
             new_ptr
         }
     }

src/librustc/diagnostics.rs

@@ -292,7 +292,7 @@ E0072: r##"
 When defining a recursive struct or enum, any use of the type being defined
 from inside the definition must occur behind a pointer (like `Box` or `&`).
 This is because structs and enums must have a well-defined size, and without
-the pointer the size of the type would need to be unbounded.
+the pointer, the size of the type would need to be unbounded.
 
 Consider the following erroneous definition of a type for a list of bytes:
 

src/librustc/middle/lang_items.rs

@@ -189,13 +189,19 @@ impl<'a, 'tcx> LanguageItemCollector<'a, 'tcx> {
         match self.items.items[item_index] {
             Some(original_def_id) if original_def_id != item_def_id => {
                 let cstore = &self.session.cstore;
-                let span = self.ast_map.span_if_local(item_def_id)
-                                       .expect("we should have found local duplicate earlier");
-                let mut err = struct_span_err!(self.session,
-                                               span,
-                                               E0152,
-                                               "duplicate lang item found: `{}`.",
-                                               LanguageItems::item_name(item_index));
+                let name = LanguageItems::item_name(item_index);
+                let mut err = match self.ast_map.span_if_local(item_def_id) {
+                    Some(span) => struct_span_err!(
+                        self.session,
+                        span,
+                        E0152,
+                        "duplicate lang item found: `{}`.",
+                        name),
+                    None => self.session.struct_err(&format!(
+                            "duplicate lang item in crate `{}`: `{}`.",
+                            cstore.crate_name(item_def_id.krate),
+                            name)),
+                };
                 if let Some(span) = self.ast_map.span_if_local(original_def_id) {
                     span_note!(&mut err, span,
                                "first defined here.");

src/librustc_trans/callee.rs

@@ -582,15 +582,19 @@ fn get_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
         debug!("get_fn: not casting pointer!");
 
         attributes::from_fn_attrs(ccx, attrs, llfn);
-        if let Some(id) = local_item {
+        if local_item.is_some() {
             // FIXME(eddyb) Doubt all extern fn should allow unwinding.
             attributes::unwind(llfn, true);
-            ccx.item_symbols().borrow_mut().insert(id, sym);
         }
 
         llfn
     };
 
+    // Always insert into item_symbols, in case this item is exported.
+    if let Some(id) = local_item {
+        ccx.item_symbols().borrow_mut().insert(id, sym);
+    }
+
     ccx.instances().borrow_mut().insert(instance, llfn);
 
     immediate_rvalue(llfn, fn_ptr_ty)

src/librustdoc/html/render.rs

@@ -2489,7 +2489,7 @@ fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLi
     }
 
     fn doctraititem(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item,
-                    link: AssocItemLink, render_static: bool,
+                    link: AssocItemLink, render_static: bool, is_default_item: bool,
                     outer_version: Option<&str>) -> fmt::Result {
         let shortty = shortty(item);
         let name = item.name.as_ref().unwrap();
@@ -2540,17 +2540,16 @@ fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLi
             _ => panic!("can't make docs for trait item with name {:?}", item.name)
         }
 
-        match link {
-            AssocItemLink::Anchor if !is_static || render_static => {
-                document(w, cx, item)
-            },
-            _ => Ok(()),
+        if !is_default_item && (!is_static || render_static) {
+            document(w, cx, item)
+        } else {
+            Ok(())
         }
     }
 
     write!(w, "<div class='impl-items'>")?;
     for trait_item in &i.impl_.items {
-        doctraititem(w, cx, trait_item, link, render_header, outer_version)?;
+        doctraititem(w, cx, trait_item, link, render_header, false, outer_version)?;
     }
 
     fn render_default_items(w: &mut fmt::Formatter,
@@ -2567,7 +2566,7 @@ fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLi
             let did = i.trait_.as_ref().unwrap().def_id().unwrap();
             let assoc_link = AssocItemLink::GotoSource(did, &i.provided_trait_methods);
 
-            doctraititem(w, cx, trait_item, assoc_link, render_static,
+            doctraititem(w, cx, trait_item, assoc_link, render_static, true,
                          outer_version)?;
         }
         Ok(())

src/libsyntax/ext/expand.rs

@@ -504,6 +504,13 @@ pub fn expand_item_mac(it: P<ast::Item>,
 
 /// Expand a stmt
 fn expand_stmt(stmt: Stmt, fld: &mut MacroExpander) -> SmallVector<Stmt> {
+    // perform all pending renames
+    let stmt = {
+        let pending_renames = &mut fld.cx.syntax_env.info().pending_renames;
+        let mut rename_fld = IdentRenamer{renames:pending_renames};
+        rename_fld.fold_stmt(stmt).expect_one("rename_fold didn't return one value")
+    };
+
     let (mac, style, attrs) = match stmt.node {
         StmtKind::Mac(mac, style, attrs) => (mac, style, attrs),
         _ => return expand_non_macro_stmt(stmt, fld)
@@ -717,14 +724,8 @@ pub fn expand_block(blk: P<Block>, fld: &mut MacroExpander) -> P<Block> {
 pub fn expand_block_elts(b: P<Block>, fld: &mut MacroExpander) -> P<Block> {
     b.map(|Block {id, stmts, expr, rules, span}| {
         let new_stmts = stmts.into_iter().flat_map(|x| {
-            // perform all pending renames
-            let renamed_stmt = {
-                let pending_renames = &mut fld.cx.syntax_env.info().pending_renames;
-                let mut rename_fld = IdentRenamer{renames:pending_renames};
-                rename_fld.fold_stmt(x).expect_one("rename_fold didn't return one value")
-            };
-            // expand macros in the statement
-            fld.fold_stmt(renamed_stmt).into_iter()
+            // perform pending renames and expand macros in the statement
+            fld.fold_stmt(x).into_iter()
         }).collect();
         let new_expr = expr.map(|x| {
             let expr = {

src/libsyntax/ext/tt/macro_rules.rs

@@ -1014,6 +1014,7 @@ fn is_in_follow(_: &ExtCtxt, tok: &Token, frag: &str) -> Result<bool, String> {
                 match *tok {
                     OpenDelim(token::DelimToken::Brace) | OpenDelim(token::DelimToken::Bracket) |
                     Comma | FatArrow | Colon | Eq | Gt | Semi | BinOp(token::Or) => Ok(true),
+                    MatchNt(_, ref frag, _, _) if frag.name.as_str() == "block" => Ok(true),
                     Ident(i, _) if (i.name.as_str() == "as" ||
                                     i.name.as_str() == "where") => Ok(true),
                     _ => Ok(false)