Auto merge of #85984 - JohnTitor:rollup-rq0g9ph, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - #85717 (Document `From` impls for cow.rs)
 - #85850 (Remove unused feature gates)
 - #85888 (Fix typo in internal documentation for `TrustedRandomAccess`)
 - #85889 (Restoring the `num_def_ids` function in the CStore API )
 - #85899 (jsondocck small cleanup)
 - #85937 (Fix bad suggestions for code from proc_macro)
 - #85963 (Show `::{{constructor}}` in std::any::type_name().)
 - #85977 (Fix linkcheck script from getting out of sync.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

src/test/ui/suggestions/auxiliary/proc-macro-type-error.rs

@@ -0,0 +1,18 @@
+// force-host
+// no-prefer-dynamic
+#![crate_type = "proc-macro"]
+#![feature(proc_macro_quote)]
+
+extern crate proc_macro;
+
+use proc_macro::{quote, TokenStream};
+
+#[proc_macro_attribute]
+pub fn hello(_: TokenStream, _: TokenStream) -> TokenStream {
+    quote!(
+        fn f(_: &mut i32) {}
+        fn g() {
+            f(123);
+        }
+    )
+}

src/test/ui/suggestions/suggest-ref-macro.rs

@@ -0,0 +1,29 @@
+// run-check
+// aux-build:proc-macro-type-error.rs
+
+extern crate proc_macro_type_error;
+
+use proc_macro_type_error::hello;
+
+#[hello] //~ERROR mismatched types
+fn abc() {}
+
+fn x(_: &mut i32) {}
+
+macro_rules! bla {
+    () => {
+        x(123);
+        //~^ ERROR mismatched types
+        //~| SUGGESTION &mut 123
+    };
+    ($v:expr) => {
+        x($v)
+    }
+}
+
+fn main() {
+    bla!();
+    bla!(456);
+    //~^ ERROR mismatched types
+    //~| SUGGESTION &mut 456
+}

src/test/ui/suggestions/suggest-ref-macro.stderr

@@ -0,0 +1,34 @@
+error[E0308]: mismatched types
+  --> $DIR/suggest-ref-macro.rs:8:1
+   |
+LL | #[hello]
+   | ^^^^^^^^ expected `&mut i32`, found integer
+   |
+   = note: this error originates in the attribute macro `hello` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0308]: mismatched types
+  --> $DIR/suggest-ref-macro.rs:15:11
+   |
+LL |         x(123);
+   |           ^^^
+   |           |
+   |           expected `&mut i32`, found integer
+   |           help: consider mutably borrowing here: `&mut 123`
+...
+LL |     bla!();
+   |     ------- in this macro invocation
+   |
+   = note: this error originates in the macro `bla` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0308]: mismatched types
+  --> $DIR/suggest-ref-macro.rs:26:10
+   |
+LL |     bla!(456);
+   |          ^^^
+   |          |
+   |          expected `&mut i32`, found integer
+   |          help: consider mutably borrowing here: `&mut 456`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0308`.

src/tools/jsondocck/Cargo.toml

@@ -8,8 +8,7 @@ edition = "2018"
 jsonpath_lib = "0.2"
 getopts = "0.2"
 regex = "1.4"
-lazy_static = "1.4"
-shlex = "0.1"
-serde = "1.0"
+shlex = "1.0"
 serde_json = "1.0"
 fs-err = "2.5.0"
+once_cell = "1.0"

src/tools/jsondocck/src/main.rs

@@ -1,5 +1,5 @@
 use jsonpath_lib::select;
-use lazy_static::lazy_static;
+use once_cell::sync::Lazy;
 use regex::{Regex, RegexBuilder};
 use serde_json::Value;
 use std::borrow::Cow;
@@ -94,19 +94,19 @@ impl fmt::Display for CommandKind {
     }
 }
 
-lazy_static! {
-    static ref LINE_PATTERN: Regex = RegexBuilder::new(
+static LINE_PATTERN: Lazy<Regex> = Lazy::new(|| {
+    RegexBuilder::new(
         r#"
         \s(?P<invalid>!?)@(?P<negated>!?)
         (?P<cmd>[A-Za-z]+(?:-[A-Za-z]+)*)
         (?P<args>.*)$
-    "#
+    "#,
     )
     .ignore_whitespace(true)
     .unicode(true)
     .build()
-    .unwrap();
-}
+    .unwrap()
+});
 
 fn print_err(msg: &str, lineno: usize) {
     eprintln!("Invalid command: {} on line {}", msg, lineno)

src/tools/linkchecker/linkcheck.sh

@@ -85,11 +85,11 @@ fi
 if [ ! -e "linkchecker/main.rs" ] || [ "$iterative" = "0" ]
 then
     echo "Downloading linkchecker source..."
+    nightly_hash=$(rustc +nightly -Vv | grep commit-hash | cut -f2 -d" ")
+    url="https://raw.githubusercontent.com/rust-lang/rust"
     mkdir linkchecker
-    curl -o linkchecker/Cargo.toml \
-        https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/Cargo.toml
-    curl -o linkchecker/main.rs \
-        https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/main.rs
+    curl -o linkchecker/Cargo.toml ${url}/${nightly_hash}/src/tools/linkchecker/Cargo.toml
+    curl -o linkchecker/main.rs ${url}/${nightly_hash}/src/tools/linkchecker/main.rs
 fi
 
 echo "Building book \"$book_name\"..."
@@ -106,7 +106,7 @@ else
     check_path="linkcheck/$book_name"
 fi
 echo "Running linkchecker on \"$check_path\"..."
-cargo run --manifest-path=linkchecker/Cargo.toml -- "$check_path"
+cargo run --release --manifest-path=linkchecker/Cargo.toml -- "$check_path"
 
 if [ "$iterative" = "0" ]
 then