Merge pull request #38884 from nikomatsakis/beta-unmerged

More beta backports

Author: alexcrichton

src/bootstrap/doc.rs

@@ -147,7 +147,16 @@ pub fn std(build: &Build, stage: u32, target: &str) {
     cargo.arg("--manifest-path")
          .arg(build.src.join("src/rustc/std_shim/Cargo.toml"))
          .arg("--features").arg(build.std_features())
-         .arg("-p").arg("std");
+         .arg("--no-deps");
+
+    for krate in &["alloc", "collections", "core", "std", "std_unicode"] {
+        cargo.arg("-p").arg(krate);
+        // Create all crate output directories first to make sure rustdoc uses
+        // relative links.
+        // FIXME: Cargo should probably do this itself.
+        t!(fs::create_dir_all(out_dir.join(krate)));
+    }
+
     build.run(&mut cargo);
     cp_r(&out_dir, &out)
 }

src/librustc/session/config.rs

@@ -1172,7 +1172,8 @@ pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
                               the compiler to emit",
                  "[asm|llvm-bc|llvm-ir|obj|link|dep-info]"),
         opt::multi_s("", "print", "Comma separated list of compiler information to \
-                               print on stdout", &print_opts.join("|")),
+                               print on stdout", &format!("[{}]",
+                               &print_opts.join("|"))),
         opt::flagmulti_s("g",  "",  "Equivalent to -C debuginfo=2"),
         opt::flagmulti_s("O", "", "Equivalent to -C opt-level=2"),
         opt::opt_s("o", "", "Write output to <filename>", "FILENAME"),

src/librustc_trans/mir/block.rs

@@ -222,7 +222,11 @@ impl<'bcx, 'tcx> MirContext<'bcx, 'tcx> {
                     load
                 } else {
                     let op = self.trans_consume(&bcx, &mir::Lvalue::Local(mir::RETURN_POINTER));
-                    op.pack_if_pair(&bcx).immediate()
+                    if let Ref(llval) = op.val {
+                        bcx.with_block(|bcx| base::load_ty(&bcx, llval, op.ty))
+                    } else {
+                        op.pack_if_pair(&bcx).immediate()
+                    }
                 };
                 bcx.ret(llval);
             }

src/librustc_typeck/check/mod.rs

@@ -4580,7 +4580,6 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         // Check provided lifetime parameters.
         let lifetime_defs = segment.map_or(&[][..], |(_, generics)| &generics.regions);
         if lifetimes.len() > lifetime_defs.len() {
-            let span = lifetimes[lifetime_defs.len()].span;
             struct_span_err!(self.tcx.sess, span, E0088,
                              "too many lifetime parameters provided: \
                               expected {}, found {}",
@@ -4589,6 +4588,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                 .span_label(span, &format!("unexpected lifetime parameter{}",
                                            match lifetimes.len() { 1 => "", _ => "s" }))
                 .emit();
+        } else if lifetimes.len() > 0 && lifetimes.len() < lifetime_defs.len() {
+            struct_span_err!(self.tcx.sess, span, E0090,
+                             "too few lifetime parameters provided: \
+                             expected {}, found {}",
+                             count(lifetime_defs.len()),
+                             count(lifetimes.len()))
+                .span_label(span, &format!("too few lifetime parameters"))
+                .emit();
         }
 
         // The case where there is not enough lifetime parameters is not checked,

src/libstd/sys/windows/c.rs

@@ -282,6 +282,7 @@ pub const EXCEPTION_STACK_OVERFLOW: DWORD = 0xc00000fd;
 pub const EXCEPTION_MAXIMUM_PARAMETERS: usize = 15;
 
 pub const PIPE_ACCESS_INBOUND: DWORD = 0x00000001;
+pub const PIPE_ACCESS_OUTBOUND: DWORD = 0x00000002;
 pub const FILE_FLAG_FIRST_PIPE_INSTANCE: DWORD = 0x00080000;
 pub const FILE_FLAG_OVERLAPPED: DWORD = 0x40000000;
 pub const PIPE_WAIT: DWORD = 0x00000000;

src/libstd/sys/windows/pipe.rs

@@ -29,18 +29,43 @@ pub struct AnonPipe {
     inner: Handle,
 }
 
-pub fn anon_pipe() -> io::Result<(AnonPipe, AnonPipe)> {
+pub struct Pipes {
+    pub ours: AnonPipe,
+    pub theirs: AnonPipe,
+}
+
+/// Although this looks similar to `anon_pipe` in the Unix module it's actually
+/// subtly different. Here we'll return two pipes in the `Pipes` return value,
+/// but one is intended for "us" where as the other is intended for "someone
+/// else".
+///
+/// Currently the only use case for this function is pipes for stdio on
+/// processes in the standard library, so "ours" is the one that'll stay in our
+/// process whereas "theirs" will be inherited to a child.
+///
+/// The ours/theirs pipes are *not* specifically readable or writable. Each
+/// one only supports a read or a write, but which is which depends on the
+/// boolean flag given. If `ours_readable` is true then `ours` is readable where
+/// `theirs` is writable. Conversely if `ours_readable` is false then `ours` is
+/// writable where `theirs` is readable.
+///
+/// Also note that the `ours` pipe is always a handle opened up in overlapped
+/// mode. This means that technically speaking it should only ever be used
+/// with `OVERLAPPED` instances, but also works out ok if it's only ever used
+/// once at a time (which we do indeed guarantee).
+pub fn anon_pipe(ours_readable: bool) -> io::Result<Pipes> {
     // Note that we specifically do *not* use `CreatePipe` here because
     // unfortunately the anonymous pipes returned do not support overlapped
-    // operations.
-    //
-    // Instead, we create a "hopefully unique" name and create a named pipe
-    // which has overlapped operations enabled.
+    // operations. Instead, we create a "hopefully unique" name and create a
+    // named pipe which has overlapped operations enabled.
     //
-    // Once we do this, we connect do it as usual via `CreateFileW`, and then we
-    // return those reader/writer halves.
+    // Once we do this, we connect do it as usual via `CreateFileW`, and then
+    // we return those reader/writer halves. Note that the `ours` pipe return
+    // value is always the named pipe, whereas `theirs` is just the normal file.
+    // This should hopefully shield us from child processes which assume their
+    // stdout is a named pipe, which would indeed be odd!
     unsafe {
-        let reader;
+        let ours;
         let mut name;
         let mut tries = 0;
         let mut reject_remote_clients_flag = c::PIPE_REJECT_REMOTE_CLIENTS;
@@ -54,11 +79,16 @@ pub fn anon_pipe() -> io::Result<(AnonPipe, AnonPipe)> {
                                   .encode_wide()
                                   .chain(Some(0))
                                   .collect::<Vec<_>>();
+            let mut flags = c::FILE_FLAG_FIRST_PIPE_INSTANCE |
+                c::FILE_FLAG_OVERLAPPED;
+            if ours_readable {
+                flags |= c::PIPE_ACCESS_INBOUND;
+            } else {
+                flags |= c::PIPE_ACCESS_OUTBOUND;
+            }
 
             let handle = c::CreateNamedPipeW(wide_name.as_ptr(),
-                                             c::PIPE_ACCESS_INBOUND |
-                                             c::FILE_FLAG_FIRST_PIPE_INSTANCE |
-                                             c::FILE_FLAG_OVERLAPPED,
+                                             flags,
                                              c::PIPE_TYPE_BYTE |
                                              c::PIPE_READMODE_BYTE |
                                              c::PIPE_WAIT |
@@ -101,21 +131,28 @@ pub fn anon_pipe() -> io::Result<(AnonPipe, AnonPipe)> {
                 }
                 return Err(err)
             }
-            reader = Handle::new(handle);
+            ours = Handle::new(handle);
             break
         }
 
-        // Connect to the named pipe we just created in write-only mode (also
-        // overlapped for async I/O below).
+        // Connect to the named pipe we just created. This handle is going to be
+        // returned in `theirs`, so if `ours` is readable we want this to be
+        // writable, otherwise if `ours` is writable we want this to be
+        // readable.
+        //
+        // Additionally we don't enable overlapped mode on this because most
+        // client processes aren't enabled to work with that.
         let mut opts = OpenOptions::new();
-        opts.write(true);
-        opts.read(false);
+        opts.write(ours_readable);
+        opts.read(!ours_readable);
         opts.share_mode(0);
-        opts.attributes(c::FILE_FLAG_OVERLAPPED);
-        let writer = File::open(Path::new(&name), &opts)?;
-        let writer = AnonPipe { inner: writer.into_handle() };
+        let theirs = File::open(Path::new(&name), &opts)?;
+        let theirs = AnonPipe { inner: theirs.into_handle() };
 
-        Ok((AnonPipe { inner: reader }, AnonPipe { inner: writer.into_handle() }))
+        Ok(Pipes {
+            ours: AnonPipe { inner: ours },
+            theirs: AnonPipe { inner: theirs.into_handle() },
+        })
     }
 }
 

src/libstd/sys/windows/process.rs

@@ -264,19 +264,15 @@ impl Stdio {
             }
 
             Stdio::MakePipe => {
-                let (reader, writer) = pipe::anon_pipe()?;
-                let (ours, theirs) = if stdio_id == c::STD_INPUT_HANDLE {
-                    (writer, reader)
-                } else {
-                    (reader, writer)
-                };
-                *pipe = Some(ours);
+                let ours_readable = stdio_id != c::STD_INPUT_HANDLE;
+                let pipes = pipe::anon_pipe(ours_readable)?;
+                *pipe = Some(pipes.ours);
                 cvt(unsafe {
-                    c::SetHandleInformation(theirs.handle().raw(),
+                    c::SetHandleInformation(pipes.theirs.handle().raw(),
                                             c::HANDLE_FLAG_INHERIT,
                                             c::HANDLE_FLAG_INHERIT)
                 })?;
-                Ok(theirs.into_handle())
+                Ok(pipes.theirs.into_handle())
             }
 
             Stdio::Handle(ref handle) => {

src/libsyntax/fold.rs

@@ -544,19 +544,19 @@ pub fn noop_fold_arg<T: Folder>(Arg {id, pat, ty}: Arg, fld: &mut T) -> Arg {
 pub fn noop_fold_tt<T: Folder>(tt: &TokenTree, fld: &mut T) -> TokenTree {
     match *tt {
         TokenTree::Token(span, ref tok) =>
-            TokenTree::Token(span, fld.fold_token(tok.clone())),
+            TokenTree::Token(fld.new_span(span), fld.fold_token(tok.clone())),
         TokenTree::Delimited(span, ref delimed) => {
-            TokenTree::Delimited(span, Rc::new(
+            TokenTree::Delimited(fld.new_span(span), Rc::new(
                             Delimited {
                                 delim: delimed.delim,
-                                open_span: delimed.open_span,
+                                open_span: fld.new_span(delimed.open_span),
                                 tts: fld.fold_tts(&delimed.tts),
-                                close_span: delimed.close_span,
+                                close_span: fld.new_span(delimed.close_span),
                             }
                         ))
         },
         TokenTree::Sequence(span, ref seq) =>
-            TokenTree::Sequence(span,
+            TokenTree::Sequence(fld.new_span(span),
                        Rc::new(SequenceRepetition {
                            tts: fld.fold_tts(&seq.tts),
                            separator: seq.separator.clone().map(|tok| fld.fold_token(tok)),
@@ -649,7 +649,7 @@ pub fn noop_fold_fn_decl<T: Folder>(decl: P<FnDecl>, fld: &mut T) -> P<FnDecl> {
         inputs: inputs.move_map(|x| fld.fold_arg(x)),
         output: match output {
             FunctionRetTy::Ty(ty) => FunctionRetTy::Ty(fld.fold_ty(ty)),
-            FunctionRetTy::Default(span) => FunctionRetTy::Default(span),
+            FunctionRetTy::Default(span) => FunctionRetTy::Default(fld.new_span(span)),
         },
         variadic: variadic
     })
@@ -676,7 +676,7 @@ pub fn noop_fold_ty_param<T: Folder>(tp: TyParam, fld: &mut T) -> TyParam {
         ident: ident,
         bounds: fld.fold_bounds(bounds),
         default: default.map(|x| fld.fold_ty(x)),
-        span: span
+        span: fld.new_span(span),
     }
 }
 

src/test/compile-fail-fulldeps/proc-macro/auxiliary/issue_38586.rs

@@ -0,0 +1,22 @@
+// Copyright 2016 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.
+
+// force-host
+// no-prefer-dynamic
+
+#![feature(proc_macro, proc_macro_lib)]
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+#[proc_macro_derive(A)]
+pub fn derive_a(_: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    "fn f() { println!(\"{}\", foo); }".parse().unwrap()
+}

src/test/compile-fail-fulldeps/proc-macro/issue-38586.rs

@@ -0,0 +1,21 @@
+// Copyright 2016 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:issue_38586.rs
+
+#![feature(proc_macro)]
+
+#[macro_use]
+extern crate issue_38586;
+
+#[derive(A)] //~ ERROR `foo`
+struct A;
+
+fn main() {}

src/test/compile-fail/E0090.rs

@@ -0,0 +1,15 @@
+// Copyright 2016 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.
+
+fn foo<'a: 'b, 'b: 'a>() {}
+fn main() {
+    foo::<'static>();//~ ERROR E0090
+                     //~^ too few lifetime parameters
+}

src/test/run-pass/issue-38727.rs

@@ -0,0 +1,21 @@
+// 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.
+
+#[repr(u64)]
+enum A {
+    A = 0u64,
+    B = !0u64,
+}
+
+fn cmp() -> A {
+    A::B
+}
+
+fn main() {}