Auto merge of #48017 - kennytm:rollup, r=kennytm

Rollup of 10 pull requests

- Successful merges: #46030, #47496, #47543, #47704, #47753, #47807, #47948, #47959, #48003, #48007
- Failed merges:

Author: bors

Diff for: src/Cargo.lock

@@ -141,9 +141,9 @@ pub trait AsRef<T: ?Sized> {
 ///
 /// # Generic Implementations
 ///
-/// - `AsMut` auto-dereferences if the inner type is a reference or a mutable
-///   reference (e.g.: `foo.as_ref()` will work the same if `foo` has type
-///   `&mut Foo` or `&&mut Foo`)
+/// - `AsMut` auto-dereferences if the inner type is a mutable reference
+///   (e.g.: `foo.as_mut()` will work the same if `foo` has type `&mut Foo`
+///   or `&mut &mut Foo`)
 ///
 /// # Examples
 ///

Diff for: src/doc/book

@@ -1042,11 +1042,20 @@ pub fn check_ast_crate(sess: &Session, krate: &ast::Crate) {
     // Put the lint store levels and passes back in the session.
     cx.lint_sess.restore(&sess.lint_store);
 
-    // Emit all buffered lints from early on in the session now that we've
-    // calculated the lint levels for all AST nodes.
-    for (_id, lints) in cx.buffered.map {
-        for early_lint in lints {
-            span_bug!(early_lint.span, "failed to process buffered lint here");
+    // All of the buffered lints should have been emitted at this point.
+    // If not, that means that we somehow buffered a lint for a node id
+    // that was not lint-checked (perhaps it doesn't exist?). This is a bug.
+    //
+    // Rustdoc runs everybody-loops before the early lints and removes
+    // function bodies, so it's totally possible for linted
+    // node ids to not exist (e.g. macros defined within functions for the
+    // unused_macro lint) anymore. So we only run this check
+    // when we're not in rustdoc mode. (see issue #47639)
+    if !sess.opts.actually_rustdoc {
+        for (_id, lints) in cx.buffered.map {
+            for early_lint in lints {
+                span_bug!(early_lint.span, "failed to process buffered lint here");
+            }
         }
     }
 }

Diff for: src/doc/reference

@@ -1068,22 +1068,12 @@ impl<'a, 'tcx> BorrowckCtxt<'a, 'tcx> {
         };
 
         match cause {
-            mc::AliasableStatic => {
-                // This happens when we have an `&mut` or assignment to a
-                // static. We should have already reported a mutability
-                // violation first, but may have continued compiling.
-                self.tcx.sess.delay_span_bug(
-                    span,
-                    &format!("aliasability violation for static `{}`", prefix)
-                );
-                return;
-            }
             mc::AliasableStaticMut => {
                 // This path cannot occur. `static mut X` is not checked
                 // for aliasability violations.
                 span_bug!(span, "aliasability violation for static mut `{}`", prefix)
             }
-            mc::AliasableBorrowed => {}
+            mc::AliasableStatic | mc::AliasableBorrowed => {}
         };
         let blame = cmt.immutability_blame();
         let mut err = match blame {

Diff for: src/doc/unstable-book/src/language-features/use-nested-groups.md

@@ -791,7 +791,7 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
         field_ref: &ast::Field,
         variant: &ty::VariantDef,
     ) -> Option<Ref> {
-        let f = variant.field_named(field_ref.ident.node.name);
+        let f = variant.find_field_named(field_ref.ident.node.name)?;
         // We don't really need a sub-span here, but no harm done
         let sub_span = self.span_utils.span_for_last_ident(field_ref.ident.span);
         filter!(self.span_utils, sub_span, field_ref.ident.span, None);
@@ -870,6 +870,17 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
                         result.push_str(&val.as_str());
                     }
                     result.push('\n');
+                } else if let Some(meta_list) = attr.meta_item_list() {
+                    meta_list.into_iter()
+                             .filter(|it| it.check_name("include"))
+                             .filter_map(|it| it.meta_item_list().map(|l| l.to_owned()))
+                             .flat_map(|it| it)
+                             .filter(|meta| meta.check_name("contents"))
+                             .filter_map(|meta| meta.value_str())
+                             .for_each(|val| {
+                                 result.push_str(&val.as_str());
+                                 result.push('\n');
+                             });
                 }
             }
         }

Diff for: src/libcore/convert.rs

@@ -1026,9 +1026,9 @@ impl CStr {
     /// The returned slice will **not** contain the trailing nul terminator that this C
     /// string has.
     ///
-    /// > **Note**: This method is currently implemented as a 0-cost cast, but
-    /// > it is planned to alter its definition in the future to perform the
-    /// > length calculation whenever this method is called.
+    /// > **Note**: This method is currently implemented as a constant-time
+    /// > cast, but it is planned to alter its definition in the future to
+    /// > perform the length calculation whenever this method is called.
     ///
     /// # Examples
     ///
@@ -1077,9 +1077,9 @@ impl CStr {
     /// it will return an error with details of where UTF-8 validation failed.
     ///
     /// > **Note**: This method is currently implemented to check for validity
-    /// > after a 0-cost cast, but it is planned to alter its definition in the
-    /// > future to perform the length calculation in addition to the UTF-8
-    /// > check whenever this method is called.
+    /// > after a constant-time cast, but it is planned to alter its definition
+    /// > in the future to perform the length calculation in addition to the
+    /// > UTF-8 check whenever this method is called.
     ///
     /// [`&str`]: ../primitive.str.html
     ///
@@ -1110,9 +1110,9 @@ impl CStr {
     /// with the result.
     ///
     /// > **Note**: This method is currently implemented to check for validity
-    /// > after a 0-cost cast, but it is planned to alter its definition in the
-    /// > future to perform the length calculation in addition to the UTF-8
-    /// > check whenever this method is called.
+    /// > after a constant-time cast, but it is planned to alter its definition
+    /// > in the future to perform the length calculation in addition to the
+    /// > UTF-8 check whenever this method is called.
     ///
     /// [`Cow`]: ../borrow/enum.Cow.html
     /// [`Borrowed`]: ../borrow/enum.Cow.html#variant.Borrowed