Auto merge of #62935 - Centril:rollup-hzj9att, r=Centril

Rollup of 10 pull requests

Successful merges:

 - #62641 (Regenerate character tables for Unicode 12.1)
 - #62716 (state also in the intro that UnsafeCell has no effect on &mut)
 - #62738 (Remove uses of mem::uninitialized from std::sys::cloudabi)
 - #62772 (Suggest trait bound on type parameter when it is unconstrained)
 - #62890 (Normalize use of backticks in compiler messages for libsyntax/*)
 - #62905 (Normalize use of backticks in compiler messages for doc)
 - #62916 (Add test `self-in-enum-definition`)
 - #62917 (Always emit trailing slash error)
 - #62926 (Fix typo in mem::uninitialized doc)
 - #62927 (use PanicMessage in MIR, kill InterpError::description)

Failed merges:

r? @ghost

5 files changed, 6 insertions, 6 deletions

diff --git a/src/libsyntax/attr/mod.rs b/src/libsyntax/attr/mod.rs
index a9f2429560a..7be21ff9029 100644
--- a/src/libsyntax/attr/mod.rs
+++ b/src/libsyntax/attr/mod.rs
@@ -30,7 +30,7 @@ use std::iter;
 use std::ops::DerefMut;
 
 pub fn mark_used(attr: &Attribute) {
-    debug!("Marking {:?} as used.", attr);
+    debug!("marking {:?} as used", attr);
     GLOBALS.with(|globals| {
         globals.used_attrs.lock().insert(attr.id);
     });
@@ -43,7 +43,7 @@ pub fn is_used(attr: &Attribute) -> bool {
 }
 
 pub fn mark_known(attr: &Attribute) {
-    debug!("Marking {:?} as known.", attr);
+    debug!("marking {:?} as known", attr);
     GLOBALS.with(|globals| {
         globals.known_attrs.lock().insert(attr.id);
     });
diff --git a/src/libsyntax/error_codes.rs b/src/libsyntax/error_codes.rs
index e2d212eb721..029ce73498c 100644
--- a/src/libsyntax/error_codes.rs
+++ b/src/libsyntax/error_codes.rs
@@ -182,7 +182,7 @@ beta compilers will not comply.
 Example of erroneous code (on a stable compiler):
 
 ```ignore (depends on release channel)
-#![feature(non_ascii_idents)] // error: #![feature] may not be used on the
+#![feature(non_ascii_idents)] // error: `#![feature]` may not be used on the
                               //        stable release channel
 ```
 
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index ae72f1fd108..14d573d07d0 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -602,7 +602,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             None => return TokenStream::empty(),
         }
         self.cx.span_err(span, "custom attribute invocations must be \
-            of the form #[foo] or #[foo(..)], the macro name must only be \
+            of the form `#[foo]` or `#[foo(..)]`, the macro name must only be \
             followed by a delimiter token");
         TokenStream::empty()
     }
diff --git a/src/libsyntax/parse/unescape_error_reporting.rs b/src/libsyntax/parse/unescape_error_reporting.rs
index bc3ee8620e0..7eee07e61a9 100644
--- a/src/libsyntax/parse/unescape_error_reporting.rs
+++ b/src/libsyntax/parse/unescape_error_reporting.rs
@@ -190,7 +190,7 @@ pub(crate) fn emit_unescape_error(
             handler.span_err(span, "empty character literal")
         }
         EscapeError::LoneSlash => {
-            panic!("lexer accepted unterminated literal with trailing slash")
+            handler.span_err(span, "invalid trailing slash in literal")
         }
     }
 }
diff --git a/src/libsyntax/test.rs b/src/libsyntax/test.rs
index d82cdce2ce9..2ada7104843 100644
--- a/src/libsyntax/test.rs
+++ b/src/libsyntax/test.rs
@@ -414,7 +414,7 @@ fn get_test_runner(sd: &errors::Handler, krate: &ast::Crate) -> Option<ast::Path
     test_attr.meta_item_list().map(|meta_list| {
         if meta_list.len() != 1 {
             sd.span_fatal(test_attr.span,
-                "#![test_runner(..)] accepts exactly 1 argument").raise()
+                "`#![test_runner(..)]` accepts exactly 1 argument").raise()
         }
         match meta_list[0].meta_item() {
             Some(meta_item) if meta_item.is_word() => meta_item.path.clone(),