Auto merge of #71356 - Dylan-DPC:rollup-liockhk, r=Dylan-DPC

Rollup of 5 pull requests

Successful merges:

 - #71250 (Replace big JS dict with JSON parsing)
 - #71270 (Fix `has_no_input_arg` check and rename it to `has_only_self_parameter`)
 - #71284 (fix -Zast-json to output correct JSON form)
 - #71328 (Stabilize PathBuf capacity methods)
 - #71334 (Update pattern docs.)

Failed merges:

r? @ghost

11 files changed, 223 insertions, 60 deletions

diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index dc7637cfdb9..2c11d5cd257 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -3010,6 +3010,12 @@ impl str {
     ///
     /// Returns `false` if it does not.
     ///
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
+    ///
     /// # Examples
     ///
     /// Basic usage:
@@ -3031,6 +3037,12 @@ impl str {
     ///
     /// Returns `false` if it does not.
     ///
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
+    ///
     /// # Examples
     ///
     /// Basic usage:
@@ -3051,6 +3063,12 @@ impl str {
     ///
     /// Returns `false` if it does not.
     ///
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
+    ///
     /// # Examples
     ///
     /// Basic usage:
@@ -3074,10 +3092,12 @@ impl str {
     ///
     /// Returns [`None`] if the pattern doesn't match.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if
-    /// a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
     ///
     /// [`None`]: option/enum.Option.html#variant.None
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Examples
     ///
@@ -3121,10 +3141,12 @@ impl str {
     ///
     /// Returns [`None`] if the pattern doesn't match.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if
-    /// a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
     ///
     /// [`None`]: option/enum.Option.html#variant.None
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Examples
     ///
@@ -3166,8 +3188,11 @@ impl str {
     /// An iterator over substrings of this string slice, separated by
     /// characters matched by a pattern.
     ///
-    /// The pattern can be any type that implements the Pattern trait. Notable
-    /// examples are `&str`, [`char`], and closures that determines the split.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3285,6 +3310,12 @@ impl str {
     /// `split` in that `split_inclusive` leaves the matched part as the
     /// terminator of the substring.
     ///
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
+    ///
     /// # Examples
     ///
     /// ```
@@ -3319,8 +3350,11 @@ impl str {
     /// An iterator over substrings of the given string slice, separated by
     /// characters matched by a pattern and yielded in reverse order.
     ///
-    /// The pattern can be any type that implements the Pattern trait. Notable
-    /// examples are `&str`, [`char`], and closures that determines the split.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3370,8 +3404,11 @@ impl str {
     /// An iterator over substrings of the given string slice, separated by
     /// characters matched by a pattern.
     ///
-    /// The pattern can be any type that implements the Pattern trait. Notable
-    /// examples are `&str`, [`char`], and closures that determines the split.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// Equivalent to [`split`], except that the trailing substring
     /// is skipped if empty.
@@ -3414,10 +3451,11 @@ impl str {
     /// An iterator over substrings of `self`, separated by characters
     /// matched by a pattern and yielded in reverse order.
     ///
-    /// The pattern can be any type that implements the Pattern trait. Notable
-    /// examples are `&str`, [`char`], and closures that determines the split.
-    /// Additional libraries might provide more complex patterns like
-    /// regular expressions.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// Equivalent to [`split`], except that the trailing substring is
     /// skipped if empty.
@@ -3462,8 +3500,11 @@ impl str {
     /// If `n` substrings are returned, the last substring (the `n`th substring)
     /// will contain the remainder of the string.
     ///
-    /// The pattern can be any type that implements the Pattern trait. Notable
-    /// examples are `&str`, [`char`], and closures that determines the split.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3512,8 +3553,11 @@ impl str {
     /// If `n` substrings are returned, the last substring (the `n`th substring)
     /// will contain the remainder of the string.
     ///
-    /// The pattern can be any type that implements the Pattern trait. Notable
-    /// examples are `&str`, [`char`], and closures that determines the split.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3557,8 +3601,11 @@ impl str {
     /// An iterator over the disjoint matches of a pattern within the given string
     /// slice.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if
-    /// a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3593,8 +3640,11 @@ impl str {
     /// An iterator over the disjoint matches of a pattern within this string slice,
     /// yielded in reverse order.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if
-    /// a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3634,8 +3684,11 @@ impl str {
     /// For matches of `pat` within `self` that overlap, only the indices
     /// corresponding to the first match are returned.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines
-    /// if a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3676,8 +3729,11 @@ impl str {
     /// For matches of `pat` within `self` that overlap, only the indices
     /// corresponding to the last match are returned.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if a
-    /// character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Iterator behavior
     ///
@@ -3894,8 +3950,11 @@ impl str {
     /// Returns a string slice with all prefixes and suffixes that match a
     /// pattern repeatedly removed.
     ///
-    /// The pattern can be a [`char`] or a closure that determines if a
-    /// character matches.
+    /// The [pattern] can be a [`char`], a slice of [`char`]s, or a function
+    /// or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Examples
     ///
@@ -3939,8 +3998,11 @@ impl str {
     /// Returns a string slice with all prefixes that match a pattern
     /// repeatedly removed.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if
-    /// a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Text directionality
     ///
@@ -3981,6 +4043,12 @@ impl str {
     ///
     /// If the string does not start with `prefix`, `None` is returned.
     ///
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
+    ///
     /// # Examples
     ///
     /// ```
@@ -4005,6 +4073,12 @@ impl str {
     ///
     /// If the string does not end with `suffix`, `None` is returned.
     ///
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
+    ///
     /// # Examples
     ///
     /// ```
@@ -4027,8 +4101,11 @@ impl str {
     /// Returns a string slice with all suffixes that match a pattern
     /// repeatedly removed.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that
-    /// determines if a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
+    ///
+    /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Text directionality
     ///
@@ -4073,10 +4150,11 @@ impl str {
     /// Returns a string slice with all prefixes that match a pattern
     /// repeatedly removed.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that determines if
-    /// a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
     ///
     /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Text directionality
     ///
@@ -4109,10 +4187,11 @@ impl str {
     /// Returns a string slice with all suffixes that match a pattern
     /// repeatedly removed.
     ///
-    /// The pattern can be a `&str`, [`char`], or a closure that
-    /// determines if a character matches.
+    /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
+    /// function or closure that determines if a character matches.
     ///
     /// [`char`]: primitive.char.html
+    /// [pattern]: str/pattern/index.html
     ///
     /// # Text directionality
     ///
diff --git a/src/libcore/str/pattern.rs b/src/libcore/str/pattern.rs
index 708e4e5560e..2377536c156 100644
--- a/src/libcore/str/pattern.rs
+++ b/src/libcore/str/pattern.rs
@@ -1,7 +1,41 @@
 //! The string Pattern API.
 //!
+//! The Pattern API provides a generic mechanism for using different pattern
+//! types when searching through a string.
+//!
 //! For more details, see the traits [`Pattern`], [`Searcher`],
 //! [`ReverseSearcher`], and [`DoubleEndedSearcher`].
+//!
+//! Although this API is unstable, it is exposed via stable APIs on the
+//! [`str`] type.
+//!
+//! # Examples
+//!
+//! [`Pattern`] is [implemented][pattern-impls] in the stable API for
+//! [`&str`], [`char`], slices of [`char`], and functions and closures
+//! implementing `FnMut(char) -> bool`.
+//!
+//! ```
+//! let s = "Can you find a needle in a haystack?";
+//!
+//! // &str pattern
+//! assert_eq!(s.find("you"), Some(4));
+//! // char pattern
+//! assert_eq!(s.find('n'), Some(2));
+//! // slice of chars pattern
+//! assert_eq!(s.find(&['a', 'e', 'i', 'o', 'u'][..]), Some(1));
+//! // closure pattern
+//! assert_eq!(s.find(|c: char| c.is_ascii_punctuation()), Some(35));
+//! ```
+//!
+//! [`&str`]: ../../../std/primitive.str.html
+//! [`char`]: ../../../std/primitive.char.html
+//! [`str`]: ../../../std/primitive.str.html
+//! [`DoubleEndedSearcher`]: trait.DoubleEndedSearcher.html
+//! [`Pattern`]: trait.Pattern.html
+//! [`ReverseSearcher`]: trait.ReverseSearcher.html
+//! [`Searcher`]: trait.Searcher.html
+//! [pattern-impls]: trait.Pattern.html#implementors
 
 #![unstable(
     feature = "pattern",
@@ -702,7 +736,7 @@ unsafe impl<'a, 'b> ReverseSearcher<'a> for CharSliceSearcher<'a, 'b> {
 
 impl<'a, 'b> DoubleEndedSearcher<'a> for CharSliceSearcher<'a, 'b> {}
 
-/// Searches for chars that are equal to any of the chars in the array.
+/// Searches for chars that are equal to any of the chars in the slice.
 ///
 /// # Examples
 ///
diff --git a/src/librustc_ast/ast.rs b/src/librustc_ast/ast.rs
index 518e906f6ea..14181e440e9 100644
--- a/src/librustc_ast/ast.rs
+++ b/src/librustc_ast/ast.rs
@@ -2211,14 +2211,14 @@ rustc_index::newtype_index! {
 }
 
 impl rustc_serialize::Encodable for AttrId {
-    fn encode<S: Encoder>(&self, _: &mut S) -> Result<(), S::Error> {
-        Ok(())
+    fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
+        s.emit_unit()
     }
 }
 
 impl rustc_serialize::Decodable for AttrId {
-    fn decode<D: Decoder>(_: &mut D) -> Result<AttrId, D::Error> {
-        Ok(crate::attr::mk_attr_id())
+    fn decode<D: Decoder>(d: &mut D) -> Result<AttrId, D::Error> {
+        d.read_nil().map(|_| crate::attr::mk_attr_id())
     }
 }
 
diff --git a/src/librustc_typeck/check/demand.rs b/src/librustc_typeck/check/demand.rs
index 6f142f77696..7db376b20aa 100644
--- a/src/librustc_typeck/check/demand.rs
+++ b/src/librustc_typeck/check/demand.rs
@@ -222,7 +222,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let mut methods =
             self.probe_for_return_type(span, probe::Mode::MethodCall, expected, checked_ty, hir_id);
         methods.retain(|m| {
-            self.has_no_input_arg(m)
+            self.has_only_self_parameter(m)
                 && self
                     .tcx
                     .get_attrs(m.def_id)
@@ -243,10 +243,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         methods
     }
 
-    // This function checks if the method isn't static and takes other arguments than `self`.
-    fn has_no_input_arg(&self, method: &AssocItem) -> bool {
+    /// This function checks whether the method is not static and does not accept other parameters than `self`.
+    fn has_only_self_parameter(&self, method: &AssocItem) -> bool {
         match method.kind {
-            ty::AssocKind::Fn => self.tcx.fn_sig(method.def_id).inputs().skip_binder().len() == 1,
+            ty::AssocKind::Fn => {
+                method.fn_has_self_parameter
+                    && self.tcx.fn_sig(method.def_id).inputs().skip_binder().len() == 1
+            }
             _ => false,
         }
     }
diff --git a/src/librustdoc/html/render.rs b/src/librustdoc/html/render.rs
index da020b85ed4..b91aab44f10 100644
--- a/src/librustdoc/html/render.rs
+++ b/src/librustdoc/html/render.rs
@@ -789,6 +789,37 @@ themePicker.onblur = handleThemeButtonsBlur;
         Ok((ret, krates))
     }
 
+    fn collect_json(path: &Path, krate: &str) -> io::Result<(Vec<String>, Vec<String>)> {
+        let mut ret = Vec::new();
+        let mut krates = Vec::new();
+
+        if path.exists() {
+            for line in BufReader::new(File::open(path)?).lines() {
+                let line = line?;
+                if !line.starts_with("\"") {
+                    continue;
+                }
+                if line.starts_with(&format!("\"{}\"", krate)) {
+                    continue;
+                }
+                if line.ends_with(",\\") {
+                    ret.push(line[..line.len() - 2].to_string());
+                } else {
+                    // Ends with "\\" (it's the case for the last added crate line)
+                    ret.push(line[..line.len() - 1].to_string());
+                }
+                krates.push(
+                    line.split('"')
+                        .filter(|s| !s.is_empty())
+                        .next()
+                        .map(|s| s.to_owned())
+                        .unwrap_or_else(String::new),
+                );
+            }
+        }
+        Ok((ret, krates))
+    }
+
     fn show_item(item: &IndexItem, krate: &str) -> String {
         format!(
             "{{'crate':'{}','ty':{},'name':'{}','desc':'{}','p':'{}'{}}}",
@@ -909,18 +940,18 @@ themePicker.onblur = handleThemeButtonsBlur;
 
     // Update the search index
     let dst = cx.dst.join(&format!("search-index{}.js", cx.shared.resource_suffix));
-    let (mut all_indexes, mut krates) = try_err!(collect(&dst, &krate.name, "searchIndex"), &dst);
+    let (mut all_indexes, mut krates) = try_err!(collect_json(&dst, &krate.name), &dst);
     all_indexes.push(search_index);
 
     // Sort the indexes by crate so the file will be generated identically even
     // with rustdoc running in parallel.
     all_indexes.sort();
     {
-        let mut v = String::from("var searchIndex={};\n");
-        v.push_str(&all_indexes.join("\n"));
+        let mut v = String::from("var searchIndex = JSON.parse('{\\\n");
+        v.push_str(&all_indexes.join(",\\\n"));
         // "addSearchOptions" has to be called first so the crate filtering can be set before the
         // search might start (if it's set into the URL for example).
-        v.push_str("\naddSearchOptions(searchIndex);initSearch(searchIndex);");
+        v.push_str("\\\n}');\naddSearchOptions(searchIndex);initSearch(searchIndex);");
         cx.shared.fs.write(&dst, &v)?;
     }
     if options.enable_index_page {
diff --git a/src/librustdoc/html/render/cache.rs b/src/librustdoc/html/render/cache.rs
index f3c5c12810b..5b090291227 100644
--- a/src/librustdoc/html/render/cache.rs
+++ b/src/librustdoc/html/render/cache.rs
@@ -634,7 +634,7 @@ fn build_index(krate: &clean::Crate, cache: &mut Cache) -> String {
 
     // Collect the index into a string
     format!(
-        r#"searchIndex["{}"] = {};"#,
+        r#""{}":{}"#,
         krate.name,
         serde_json::to_string(&CrateData {
             doc: crate_doc,
@@ -642,6 +642,11 @@ fn build_index(krate: &clean::Crate, cache: &mut Cache) -> String {
             paths: crate_paths,
         })
         .expect("failed serde conversion")
+        // All these `replace` calls are because we have to go through JS string for JSON content.
+        .replace(r"\", r"\\")
+        .replace("'", r"\'")
+        // We need to escape double quotes for the JSON.
+        .replace("\\\"", "\\\\\"")
     )
 }
 
diff --git a/src/libstd/path.rs b/src/libstd/path.rs
index b8361d3e825..173d6d1cfa7 100644
--- a/src/libstd/path.rs
+++ b/src/libstd/path.rs
@@ -1116,7 +1116,6 @@ impl PathBuf {
     /// # Examples
     ///
     /// ```
-    /// #![feature(path_buf_capacity)]
     /// use std::path::PathBuf;
     ///
     /// let mut path = PathBuf::with_capacity(10);
@@ -1130,7 +1129,7 @@ impl PathBuf {
     ///
     /// [`with_capacity`]: ../ffi/struct.OsString.html#method.with_capacity
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[stable(feature = "path_buf_capacity", since = "1.44.0")]
     pub fn with_capacity(capacity: usize) -> PathBuf {
         PathBuf { inner: OsString::with_capacity(capacity) }
     }
@@ -1374,7 +1373,7 @@ impl PathBuf {
     ///
     /// [`capacity`]: ../ffi/struct.OsString.html#method.capacity
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[stable(feature = "path_buf_capacity", since = "1.44.0")]
     pub fn capacity(&self) -> usize {
         self.inner.capacity()
     }
@@ -1383,7 +1382,7 @@ impl PathBuf {
     ///
     /// [`clear`]: ../ffi/struct.OsString.html#method.clear
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[stable(feature = "path_buf_capacity", since = "1.44.0")]
     pub fn clear(&mut self) {
         self.inner.clear()
     }
@@ -1392,7 +1391,7 @@ impl PathBuf {
     ///
     /// [`reserve`]: ../ffi/struct.OsString.html#method.reserve
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[stable(feature = "path_buf_capacity", since = "1.44.0")]
     pub fn reserve(&mut self, additional: usize) {
         self.inner.reserve(additional)
     }
@@ -1401,7 +1400,7 @@ impl PathBuf {
     ///
     /// [`reserve_exact`]: ../ffi/struct.OsString.html#method.reserve_exact
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[stable(feature = "path_buf_capacity", since = "1.44.0")]
     pub fn reserve_exact(&mut self, additional: usize) {
         self.inner.reserve_exact(additional)
     }
@@ -1410,7 +1409,7 @@ impl PathBuf {
     ///
     /// [`shrink_to_fit`]: ../ffi/struct.OsString.html#method.shrink_to_fit
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[stable(feature = "path_buf_capacity", since = "1.44.0")]
     pub fn shrink_to_fit(&mut self) {
         self.inner.shrink_to_fit()
     }
@@ -1419,7 +1418,7 @@ impl PathBuf {
     ///
     /// [`shrink_to`]: ../ffi/struct.OsString.html#method.shrink_to
     /// [`OsString`]: ../ffi/struct.OsString.html
-    #[unstable(feature = "path_buf_capacity", issue = "58234")]
+    #[unstable(feature = "shrink_to", issue = "56431")]
     pub fn shrink_to(&mut self, min_capacity: usize) {
         self.inner.shrink_to(min_capacity)
     }
diff --git a/src/test/ui/ast-json/ast-json-noexpand-output.rs b/src/test/ui/ast-json/ast-json-noexpand-output.rs
new file mode 100644
index 00000000000..cba539f0065
--- /dev/null
+++ b/src/test/ui/ast-json/ast-json-noexpand-output.rs
@@ -0,0 +1,10 @@
+// Check that AST json printing works.
+#![crate_type = "lib"]
+
+// check-pass
+// compile-flags: -Zast-json-noexpand
+// normalize-stdout-test ":\d+" -> ":0"
+
+// Only include a single item to reduce how often the test output needs
+// updating.
+extern crate core;
diff --git a/src/test/ui/ast-json/ast-json-noexpand-output.stdout b/src/test/ui/ast-json/ast-json-noexpand-output.stdout
new file mode 100644
index 00000000000..1a07968bdf1
--- /dev/null
+++ b/src/test/ui/ast-json/ast-json-noexpand-output.stdout
@@ -0,0 +1 @@
+{"module":{"inner":{"lo":0,"hi":0},"items":[{"attrs":[],"id":0,"span":{"lo":0,"hi":0},"vis":{"node":"Inherited","span":{"lo":0,"hi":0}},"ident":{"name":"core","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":{"_field0":[[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["extern",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["crate",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["core",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":"Semi","span":{"lo":0,"hi":0}}]},"NonJoint"]]}}],"inline":true},"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"crate_type","span":{"lo":0,"hi":0}},"id":0,"args":null}]},"args":{"variant":"Eq","fields":[{"lo":0,"hi":0},{"_field0":[[{"variant":"Token","fields":[{"kind":{"variant":"Literal","fields":[{"kind":"Str","symbol":"lib","suffix":null}]},"span":{"lo":0,"hi":0}}]},"NonJoint"]]}]}}]},"id":null,"style":"Inner","span":{"lo":0,"hi":0}}],"span":{"lo":0,"hi":0},"proc_macros":[]}
diff --git a/src/test/ui/ast-json/ast-json-output.rs b/src/test/ui/ast-json/ast-json-output.rs
index e444a074602..2e009149ed6 100644
--- a/src/test/ui/ast-json/ast-json-output.rs
+++ b/src/test/ui/ast-json/ast-json-output.rs
@@ -1,7 +1,8 @@
 // Check that AST json printing works.
+#![crate_type = "lib"]
 
 // check-pass
-// compile-flags: -Zast-json-noexpand
+// compile-flags: -Zast-json
 // normalize-stdout-test ":\d+" -> ":0"
 
 // Only include a single item to reduce how often the test output needs
diff --git a/src/test/ui/ast-json/ast-json-output.stdout b/src/test/ui/ast-json/ast-json-output.stdout
index 35e418696f1..0b3704e8e00 100644
--- a/src/test/ui/ast-json/ast-json-output.stdout
+++ b/src/test/ui/ast-json/ast-json-output.stdout
@@ -1 +1 @@
-{"module":{"inner":{"lo":0,"hi":0},"items":[{"attrs":[],"id":0,"span":{"lo":0,"hi":0},"vis":{"node":"Inherited","span":{"lo":0,"hi":0}},"ident":{"name":"core","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":{"_field0":[[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["extern",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["crate",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["core",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":"Semi","span":{"lo":0,"hi":0}}]},"NonJoint"]]}}],"inline":true},"attrs":[],"span":{"lo":0,"hi":0},"proc_macros":[]}
+{"module":{"inner":{"lo":0,"hi":0},"items":[{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"prelude_import","span":{"lo":0,"hi":0}},"id":0,"args":null}]},"args":"Empty"}]},"id":null,"style":"Outer","span":{"lo":0,"hi":0}}],"id":0,"span":{"lo":0,"hi":0},"vis":{"node":"Inherited","span":{"lo":0,"hi":0}},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Use","fields":[{"prefix":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"{{root}}","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"std","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"prelude","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"v1","span":{"lo":0,"hi":0}},"id":0,"args":null}]},"kind":"Glob","span":{"lo":0,"hi":0}}]},"tokens":null},{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"macro_use","span":{"lo":0,"hi":0}},"id":0,"args":null}]},"args":"Empty"}]},"id":null,"style":"Outer","span":{"lo":0,"hi":0}}],"id":0,"span":{"lo":0,"hi":0},"vis":{"node":"Inherited","span":{"lo":0,"hi":0}},"ident":{"name":"std","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null},{"attrs":[],"id":0,"span":{"lo":0,"hi":0},"vis":{"node":"Inherited","span":{"lo":0,"hi":0}},"ident":{"name":"core","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":{"_field0":[[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["extern",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["crate",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["core",false]},"span":{"lo":0,"hi":0}}]},"NonJoint"],[{"variant":"Token","fields":[{"kind":"Semi","span":{"lo":0,"hi":0}}]},"NonJoint"]]}}],"inline":true},"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"crate_type","span":{"lo":0,"hi":0}},"id":0,"args":null}]},"args":{"variant":"Eq","fields":[{"lo":0,"hi":0},{"_field0":[[{"variant":"Token","fields":[{"kind":{"variant":"Literal","fields":[{"kind":"Str","symbol":"lib","suffix":null}]},"span":{"lo":0,"hi":0}}]},"NonJoint"]]}]}}]},"id":null,"style":"Inner","span":{"lo":0,"hi":0}}],"span":{"lo":0,"hi":0},"proc_macros":[]}