[beta] Rollup backports

RELEASES.md

@@ -1,3 +1,81 @@
+Version 1.29.0 (2018-09-13)
+==========================
+
+Compiler
+--------
+- [Bumped minimum LLVM version to 5.0.][51899]
+- [Added `powerpc64le-unknown-linux-musl` target.][51619]
+- [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
+
+Libraries
+---------
+- [`Once::call_once` now no longer requires `Once` to be `'static`.][52239]
+- [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
+- [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
+- [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
+  for `&str`.][51178]
+- [`Cell<T>` now allows `T` to be unsized.][50494]
+- [`SocketAddr` is now stable on Redox.][52656]
+
+Stabilized APIs
+---------------
+- [`Arc::downcast`]
+- [`Iterator::flatten`]
+- [`Rc::downcast`]
+
+Cargo
+-----
+- [Cargo can silently fix some bad lockfiles ][cargo/5831] You can use
+  `--locked` to disable this behaviour.
+- [`cargo-install` will now allow you to cross compile an install
+  using `--target`][cargo/5614]
+- [Added the `cargo-fix` subcommand to automatically move project code from
+  2015 edition to 2018.][cargo/5723]
+
+Misc
+----
+- [`rustdoc` now has the `--cap-lints` option which demotes all lints above
+  the specified level to that level.][52354] For example `--cap-lints warn`
+  will demote `deny` and `forbid` lints to `warn`.
+- [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
+  fails, and `101` if there is a panic.][52197]
+- [A preview of clippy has been made available through rustup.][51122]
+  You can install the preview with `rustup component add clippy-preview`
+
+Compatibility Notes
+-------------------
+- [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
+  Use `str::get_unchecked(begin..end)` instead.
+- [`std::env::home_dir` is now deprecated for its unintuitive behaviour.][51656]
+  Consider using the `home_dir` function from
+  https://crates.io/crates/dirs instead.
+- [`rustc` will no longer silently ignore invalid data in target spec.][52330]
+
+[52861]: https://github.com/rust-lang/rust/pull/52861/
+[52656]: https://github.com/rust-lang/rust/pull/52656/
+[52239]: https://github.com/rust-lang/rust/pull/52239/
+[52330]: https://github.com/rust-lang/rust/pull/52330/
+[52354]: https://github.com/rust-lang/rust/pull/52354/
+[52402]: https://github.com/rust-lang/rust/pull/52402/
+[52103]: https://github.com/rust-lang/rust/pull/52103/
+[52197]: https://github.com/rust-lang/rust/pull/52197/
+[51807]: https://github.com/rust-lang/rust/pull/51807/
+[51899]: https://github.com/rust-lang/rust/pull/51899/
+[51912]: https://github.com/rust-lang/rust/pull/51912/
+[51511]: https://github.com/rust-lang/rust/pull/51511/
+[51619]: https://github.com/rust-lang/rust/pull/51619/
+[51656]: https://github.com/rust-lang/rust/pull/51656/
+[51178]: https://github.com/rust-lang/rust/pull/51178/
+[51122]: https://github.com/rust-lang/rust/pull/51122
+[50494]: https://github.com/rust-lang/rust/pull/50494/
+[cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
+[cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
+[cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
+[`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
+[`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
+[`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
+
+
 Version 1.28.0 (2018-08-02)
 ===========================
 

src/librustc/infer/error_reporting/mod.rs

@@ -303,7 +303,14 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
     ) {
         debug!("report_region_errors(): {} errors to start", errors.len());
 
-        if will_later_be_reported_by_nll && self.tcx.use_mir_borrowck() {
+        if will_later_be_reported_by_nll &&
+            // FIXME: `use_mir_borrowck` seems wrong here...
+            self.tcx.use_mir_borrowck() &&
+            // ... this is a band-aid; may be better to explicitly
+            // match on every borrowck_mode variant to guide decision
+            // here.
+            !self.tcx.migrate_borrowck() {
+
             // With `#![feature(nll)]`, we want to present a nice user
             // experience, so don't even mention the errors from the
             // AST checker.

src/librustc_mir/transform/const_prop.rs

@@ -333,11 +333,6 @@ impl<'b, 'a, 'tcx:'b> ConstPropagator<'b, 'a, 'tcx> {
     ) -> Option<Const<'tcx>> {
         let span = source_info.span;
         match *rvalue {
-            // This branch exists for the sanity type check
-            Rvalue::Use(Operand::Constant(ref c)) => {
-                assert_eq!(c.ty, place_layout.ty);
-                self.eval_constant(c, source_info)
-            },
             Rvalue::Use(ref op) => {
                 self.eval_operand(op, source_info)
             },

src/test/ui/borrowck/issue-45983.stderr → src/test/ui/borrowck/issue-45983.ast.stderr

@@ -1,5 +1,5 @@
 error: borrowed data cannot be stored outside of its closure
-  --> $DIR/issue-45983.rs:17:27
+  --> $DIR/issue-45983.rs:36:27
    |
 LL |     let x = None;
    |         - borrowed data cannot be stored into here...

src/test/ui/borrowck/issue-45983.migrate.stderr

@@ -0,0 +1,12 @@
+error: borrowed data cannot be stored outside of its closure
+  --> $DIR/issue-45983.rs:36:27
+   |
+LL |     let x = None;
+   |         - borrowed data cannot be stored into here...
+LL |     give_any(|y| x = Some(y));
+   |              ---          ^ cannot be stored outside of its closure
+   |              |
+   |              ...because it cannot outlive this closure
+
+error: aborting due to previous error
+

src/test/ui/borrowck/issue-45983.nll.stderr

@@ -1,11 +1,11 @@
 warning: not reporting region error due to nll
-  --> $DIR/issue-45983.rs:17:27
+  --> $DIR/issue-45983.rs:36:27
    |
 LL |     give_any(|y| x = Some(y));
    |                           ^
 
 error: borrowed data escapes outside of closure
-  --> $DIR/issue-45983.rs:17:18
+  --> $DIR/issue-45983.rs:36:18
    |
 LL |     let x = None;
    |         - `x` is declared here, outside of the closure body
@@ -15,7 +15,7 @@ LL |     give_any(|y| x = Some(y));
    |               `y` is a reference that is only valid in the closure body
 
 error[E0594]: cannot assign to `x`, as it is not declared as mutable
-  --> $DIR/issue-45983.rs:17:18
+  --> $DIR/issue-45983.rs:36:18
    |
 LL |     let x = None;
    |         - help: consider changing this to be mutable: `mut x`

src/test/ui/borrowck/issue-45983.rs

@@ -8,12 +8,35 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// As documented in Issue #45983, this test is evaluating the quality
+// of our diagnostics on erroneous code using higher-ranked closures.
+//
+// However, as documented on Issue #53026, this test also became a
+// prime example of our need to test the NLL migration mode
+// *separately* from the existing test suites that focus solely on
+// AST-borrwock and NLL.
+
+// revisions: ast migrate nll
+
+// Since we are testing nll (and migration) explicitly as a separate
+// revisions, dont worry about the --compare-mode=nll on this test.
+
+// ignore-compare-mode-nll
+
+//[ast]compile-flags: -Z borrowck=ast
+//[migrate]compile-flags: -Z borrowck=migrate -Z two-phase-borrows
+//[nll]compile-flags: -Z borrowck=mir -Z two-phase-borrows
+
 fn give_any<F: for<'r> FnOnce(&'r ())>(f: F) {
     f(&());
 }
 
 fn main() {
     let x = None;
     give_any(|y| x = Some(y));
-    //~^ ERROR borrowed data cannot be stored outside of its closure
+    //[ast]~^ ERROR borrowed data cannot be stored outside of its closure
+    //[migrate]~^^ ERROR borrowed data cannot be stored outside of its closure
+    //[nll]~^^^ WARN not reporting region error due to nll
+    //[nll]~| ERROR borrowed data escapes outside of closure
+    //[nll]~| ERROR cannot assign to `x`, as it is not declared as mutable
 }

src/test/ui/const-eval/issue-53157.rs

@@ -0,0 +1,23 @@
+// 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.
+
+// compile-pass
+
+macro_rules! m {
+    () => {{
+        fn f(_: impl Sized) {}
+        f
+    }}
+}
+
+fn main() {
+    fn f() -> impl Sized {};
+    m!()(f());
+}