Auto merge of #63124 - Centril:rollup-onohtqt, r=Centril

Rollup of 12 pull requests

Successful merges:

 - #61965 (Remove mentions of removed `offset_to` method from `align_offset` docs)
 - #62928 (Syntax: Recover on `for ( $pat in $expr ) $block`)
 - #63000 (Impl Debug for Chars)
 - #63083 (Make generic parameters always use modern hygiene)
 - #63087 (Add very simple edition check to tidy.)
 - #63093 (Properly check the defining scope of existential types)
 - #63096 (Add tests for some `existential_type` ICEs)
 - #63099 (vxworks: Remove Linux-specific comments.)
 - #63106 (ci: Skip installing SWIG/xz on OSX )
 - #63108 (Add links to None in Option doc)
 - #63109 (std: Fix a failing `fs` test on Windows)
 - #63111 (Add syntactic and semantic tests for rest patterns, i.e. `..`)

Failed merges:

r? @ghost

Author: bors

.azure-pipelines/steps/run.yml

@@ -62,17 +62,6 @@ steps:
 - template: install-sccache.yml
 - template: install-clang.yml
 
-# Install some dependencies needed to build LLDB/Clang, currently only needed
-# during the `dist` target
-- bash: |
-    set -e
-    brew update
-    brew install xz
-    brew install swig@3
-    brew link --force swig@3
-  displayName: Install build dependencies (OSX)
-  condition: and(succeeded(), eq(variables['Agent.OS'], 'Darwin'), eq(variables['SCRIPT'],'./x.py dist'))
-
 # Switch to XCode 9.3 on OSX since it seems to be the last version that supports
 # i686-apple-darwin. We'll eventually want to upgrade this and it will probably
 # force us to drop i686-apple-darwin, but let's keep the wheels turning for now.

src/liballoc/tests/str.rs

@@ -1108,6 +1108,16 @@ fn test_iterator_last() {
     assert_eq!(it.last(), Some('m'));
 }
 
+#[test]
+fn test_chars_debug() {
+    let s = "ศไทย中华Việt Nam";
+    let c = s.chars();
+    assert_eq!(
+        format!("{:?}", c),
+        r#"Chars(['ศ', 'ไ', 'ท', 'ย', '中', '华', 'V', 'i', 'ệ', 't', ' ', 'N', 'a', 'm'])"#
+    );
+}
+
 #[test]
 fn test_bytesator() {
     let s = "ศไทย中华Việt Nam";