Auto merge of #52014 - pietroalbini:rollup, r=pietroalbini

Rollup of 13 pull requests

Successful merges:

 - #51548 (Initialize LLVM's AMDGPU target machine, if available.)
 - #51809 (Add read_exact_at and write_all_at methods to FileExt on unix)
 - #51914 (add outlives annotations to `BTreeMap`)
 - #51958 (Show known meta items in unknown meta items error)
 - #51973 (Make Stdio handle UnwindSafe)
 - #51977 (bootstrap: tests should use rustc from config.toml)
 - #51978 (Do not suggest changes to str literal if it isn't one)
 - #51979 (Get rid of `TyImplTraitExistential`)
 - #51980 (Emit column info in debuginfo for non msvc like targets)
 - #51982 (incr.comp.: Take names of children into account when computing the ICH of a module's HIR.)
 - #51997 (add entry for cargo-metadata feature to RELEASES)
 - #52004 (toolstate: Fixed detection of changed submodule, and other fixes.)
 - #52006 ( Change --keep-stage to apply more often)

Failed merges:

r? @ghost

src/test/ui/deprecation-sanity.rs

@@ -0,0 +1,37 @@
+// Copyright 2015 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.
+
+// Various checks that deprecation attributes are used correctly
+
+mod bogus_attribute_types_1 {
+    #[deprecated(since = "a", note = "a", reason)] //~ ERROR unknown meta item 'reason'
+    fn f1() { }
+
+    #[deprecated(since = "a", note)] //~ ERROR incorrect meta item
+    fn f2() { }
+
+    #[deprecated(since, note = "a")] //~ ERROR incorrect meta item
+    fn f3() { }
+
+    #[deprecated(since = "a", note(b))] //~ ERROR incorrect meta item
+    fn f5() { }
+
+    #[deprecated(since(b), note = "a")] //~ ERROR incorrect meta item
+    fn f6() { }
+}
+
+#[deprecated(since = "a", note = "b")]
+#[deprecated(since = "a", note = "b")]
+fn multiple1() { } //~ ERROR multiple deprecated attributes
+
+#[deprecated(since = "a", since = "b", note = "c")] //~ ERROR multiple 'since' items
+fn f1() { }
+
+fn main() { }

src/test/ui/deprecation-sanity.stderr

@@ -0,0 +1,46 @@
+error[E0541]: unknown meta item 'reason'
+  --> $DIR/deprecation-sanity.rs:14:43
+   |
+LL |     #[deprecated(since = "a", note = "a", reason)] //~ ERROR unknown meta item 'reason'
+   |                                           ^^^^^^ expected one of `since`, `note`
+
+error[E0551]: incorrect meta item
+  --> $DIR/deprecation-sanity.rs:17:31
+   |
+LL |     #[deprecated(since = "a", note)] //~ ERROR incorrect meta item
+   |                               ^^^^
+
+error[E0551]: incorrect meta item
+  --> $DIR/deprecation-sanity.rs:20:18
+   |
+LL |     #[deprecated(since, note = "a")] //~ ERROR incorrect meta item
+   |                  ^^^^^
+
+error[E0551]: incorrect meta item
+  --> $DIR/deprecation-sanity.rs:23:31
+   |
+LL |     #[deprecated(since = "a", note(b))] //~ ERROR incorrect meta item
+   |                               ^^^^^^^
+
+error[E0551]: incorrect meta item
+  --> $DIR/deprecation-sanity.rs:26:18
+   |
+LL |     #[deprecated(since(b), note = "a")] //~ ERROR incorrect meta item
+   |                  ^^^^^^^^
+
+error[E0550]: multiple deprecated attributes
+  --> $DIR/deprecation-sanity.rs:32:1
+   |
+LL | fn multiple1() { } //~ ERROR multiple deprecated attributes
+   | ^^^^^^^^^^^^^^^^^^
+
+error[E0538]: multiple 'since' items
+  --> $DIR/deprecation-sanity.rs:34:27
+   |
+LL | #[deprecated(since = "a", since = "b", note = "c")] //~ ERROR multiple 'since' items
+   |                           ^^^^^^^^^^^
+
+error: aborting due to 7 previous errors
+
+Some errors occurred: E0538, E0541, E0550, E0551.
+For more information about an error, try `rustc --explain E0538`.

src/test/ui/suggestions/issue-48364.rs

@@ -0,0 +1,16 @@
+// 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.
+
+fn foo() -> bool {
+    b"".starts_with(stringify!(foo))
+    //~^ ERROR mismatched types
+}
+
+fn main() {}

src/test/ui/suggestions/issue-48364.stderr

@@ -0,0 +1,12 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-48364.rs:12:21
+   |
+LL |     b"".starts_with(stringify!(foo))
+   |                     ^^^^^^^^^^^^^^^ expected slice, found str
+   |
+   = note: expected type `&[u8]`
+              found type `&'static str`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.