Auto merge of #50704 - kennytm:rollup, r=kennytm

Rollup of 8 pull requests

Successful merges:

 - #50624 (fs::write: Add example writing a &str)
 - #50634 (Do not silently truncate offsets for `read_at`/`write_at` on emscripten)
 - #50644 (AppVeyor: Read back trace from crash dump on failure.)
 - #50661 (Ignore non .rs files for tidy libcoretest)
 - #50663 (rustc: Allow an edition's feature on that edition)
 - #50667 (rustc: Only suggest deleting `extern crate` if it works)
 - #50670 (rustc: Include semicolon when removing `extern crate`)
 - #50678 (Update openbsd targets)

Failed merges:

src/librustc_lint/builtin.rs

@@ -1568,10 +1568,10 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ExternCrate {
 
                 if let Some(orig) = orig {
                     err.span_suggestion(it.span, &help,
-                        format!("{}use {} as {}", pub_, orig, it.name));
+                        format!("{}use {} as {};", pub_, orig, it.name));
                 } else {
                     err.span_suggestion(it.span, &help,
-                        format!("{}use {}", pub_, it.name));
+                        format!("{}use {};", pub_, it.name));
                 }
             } else {
                 err.span_suggestion(it.span, "remove it", "".into());

src/librustc_target/spec/aarch64_unknown_openbsd.rs

@@ -0,0 +1,31 @@
+// 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.
+
+use spec::{LinkerFlavor, Target, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::openbsd_base::opts();
+    base.max_atomic_width = Some(128);
+    base.abi_blacklist = super::arm_base::abi_blacklist();
+
+    Ok(Target {
+        llvm_target: "aarch64-unknown-openbsd".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "64".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        target_os: "openbsd".to_string(),
+        target_env: "".to_string(),
+        target_vendor: "unknown".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: base,
+    })
+}

src/librustc_target/spec/i686_unknown_openbsd.rs

@@ -15,6 +15,7 @@ pub fn target() -> TargetResult {
     base.cpu = "pentium4".to_string();
     base.max_atomic_width = Some(64);
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m32".to_string());
+    base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-fuse-ld=lld".to_string());
     base.stack_probes = true;
 
     Ok(Target {

src/librustc_target/spec/mod.rs

@@ -313,6 +313,7 @@ supported_targets! {
 
     ("x86_64-unknown-bitrig", x86_64_unknown_bitrig),
 
+    ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
     ("i686-unknown-openbsd", i686_unknown_openbsd),
     ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
 

src/test/ui-fulldeps/unnecessary-extern-crate.stderr

@@ -14,55 +14,55 @@ error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:19:1
    |
 LL | extern crate alloc as x;
-   | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc as x`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc as x;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:25:1
    |
 LL | pub extern crate test as y;
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use test as y`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use test as y;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:28:1
    |
 LL | pub extern crate libc;
-   | ^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use libc`
+   | ^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use libc;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:34:5
    |
 LL |     extern crate alloc;
-   |     ^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc`
+   |     ^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:37:5
    |
 LL |     extern crate alloc as x;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc as x`
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc as x;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:40:5
    |
 LL |     pub extern crate test;
-   |     ^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use test`
+   |     ^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use test;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:43:5
    |
 LL |     pub extern crate test as y;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use test as y`
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `pub use`: `pub use test as y;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:47:9
    |
 LL |         extern crate alloc;
-   |         ^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc`
+   |         ^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc;`
 
 error: `extern crate` is unnecessary in the new edition
   --> $DIR/unnecessary-extern-crate.rs:50:9
    |
 LL |         extern crate alloc as x;
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc as x`
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use alloc as x;`
 
 error: aborting due to 10 previous errors
 

src/test/ui/suggestions/auxiliary/removing-extern-crate.rs

@@ -0,0 +1,11 @@
+// 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.
+
+// intentionally blank

src/test/ui/suggestions/removing-extern-crate.fixed

@@ -0,0 +1,27 @@
+// 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-flags: --edition 2018
+// aux-build:removing-extern-crate.rs
+// run-rustfix
+// compile-pass
+
+#![warn(rust_2018_idioms)]
+#![allow(unused_imports)]
+
+use std as foo;
+
+
+mod another {
+    use std as foo;
+    use std;
+}
+
+fn main() {}

src/test/ui/suggestions/removing-extern-crate.rs

@@ -0,0 +1,27 @@
+// 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-flags: --edition 2018
+// aux-build:removing-extern-crate.rs
+// run-rustfix
+// compile-pass
+
+#![warn(rust_2018_idioms)]
+#![allow(unused_imports)]
+
+extern crate std as foo;
+extern crate core;
+
+mod another {
+    extern crate std as foo;
+    extern crate std;
+}
+
+fn main() {}

src/test/ui/suggestions/removing-extern-crate.stderr

@@ -0,0 +1,31 @@
+warning: `extern crate` is unnecessary in the new edition
+  --> $DIR/removing-extern-crate.rs:19:1
+   |
+LL | extern crate std as foo;
+   | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use std as foo;`
+   |
+note: lint level defined here
+  --> $DIR/removing-extern-crate.rs:16:9
+   |
+LL | #![warn(rust_2018_idioms)]
+   |         ^^^^^^^^^^^^^^^^
+   = note: #[warn(unnecessary_extern_crate)] implied by #[warn(rust_2018_idioms)]
+
+warning: `extern crate` is unnecessary in the new edition
+  --> $DIR/removing-extern-crate.rs:20:1
+   |
+LL | extern crate core;
+   | ^^^^^^^^^^^^^^^^^^ help: remove it
+
+warning: `extern crate` is unnecessary in the new edition
+  --> $DIR/removing-extern-crate.rs:23:5
+   |
+LL |     extern crate std as foo;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `use`: `use std as foo;`
+
+warning: `extern crate` is unnecessary in the new edition
+  --> $DIR/removing-extern-crate.rs:24:5
+   |
+LL |     extern crate std;
+   |     ^^^^^^^^^^^^^^^^^ help: use `use`: `use std;`
+