Auto merge of #96414 - Dylan-DPC:rollup-t4ofhoa, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - #90312 (Fix some confusing wording and improve slice-search-related docs)
 - #96149 (Remove unused macro rules)
 - #96279 (rustdoc: Remove .woff font files)
 - #96355 (Better handle too many `#` recovery in raw str)
 - #96379 (delay bug when adjusting `NeverToAny` twice during diagnostic code)
 - #96384 (do not consider two extern types to be similar)

Failed merges:

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

Author: bors

compiler/rustc_errors/src/diagnostic_builder.rs

@@ -255,19 +255,6 @@ impl EmissionGuarantee for ! {
 /// instead of a `&DiagnosticBuilder<'a>`. This `forward!` macro makes
 /// it easy to declare such methods on the builder.
 macro_rules! forward {
-    // Forward pattern for &self -> &Self
-    (
-        $(#[$attrs:meta])*
-        pub fn $n:ident(&self, $($name:ident: $ty:ty),* $(,)?) -> &Self
-    ) => {
-        $(#[$attrs])*
-        #[doc = concat!("See [`Diagnostic::", stringify!($n), "()`].")]
-        pub fn $n(&self, $($name: $ty),*) -> &Self {
-            self.diagnostic.$n($($name),*);
-            self
-        }
-    };
-
     // Forward pattern for &mut self -> &mut Self
     (
         $(#[$attrs:meta])*

compiler/rustc_middle/src/ty/codec.rs

@@ -453,9 +453,6 @@ macro_rules! impl_arena_allocatable_decoder {
             }
         }
     };
-    ([$ignore:ident $(, $attrs:ident)*]$args:tt) => {
-        impl_arena_allocatable_decoder!([$($attrs),*]$args);
-    };
 }
 
 macro_rules! impl_arena_allocatable_decoders {

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -431,10 +431,11 @@ impl<'a> Parser<'a> {
                 return Ok(true);
             } else if self.look_ahead(0, |t| {
                 t == &token::CloseDelim(token::Brace)
-                    || (
-                        t.can_begin_expr() && t != &token::Semi && t != &token::Pound
-                        // Avoid triggering with too many trailing `#` in raw string.
-                    )
+                    || (t.can_begin_expr() && t != &token::Semi && t != &token::Pound)
+                    // Avoid triggering with too many trailing `#` in raw string.
+                    || (sm.is_multiline(
+                        self.prev_token.span.shrink_to_hi().until(self.token.span.shrink_to_lo())
+                    ) && t == &token::Pound)
             }) {
                 // Missing semicolon typo. This is triggered if the next token could either start a
                 // new statement or is a block close. For example:
@@ -508,7 +509,12 @@ impl<'a> Parser<'a> {
         }
 
         if self.check_too_many_raw_str_terminators(&mut err) {
-            return Err(err);
+            if expected.contains(&TokenType::Token(token::Semi)) && self.eat(&token::Semi) {
+                err.emit();
+                return Ok(true);
+            } else {
+                return Err(err);
+            }
         }
 
         if self.prev_token.span == DUMMY_SP {
@@ -538,22 +544,41 @@ impl<'a> Parser<'a> {
     }
 
     fn check_too_many_raw_str_terminators(&mut self, err: &mut Diagnostic) -> bool {
+        let sm = self.sess.source_map();
         match (&self.prev_token.kind, &self.token.kind) {
             (
                 TokenKind::Literal(Lit {
                     kind: LitKind::StrRaw(n_hashes) | LitKind::ByteStrRaw(n_hashes),
                     ..
                 }),
                 TokenKind::Pound,
-            ) => {
+            ) if !sm.is_multiline(
+                self.prev_token.span.shrink_to_hi().until(self.token.span.shrink_to_lo()),
+            ) =>
+            {
+                let n_hashes: u8 = *n_hashes;
                 err.set_primary_message("too many `#` when terminating raw string");
+                let str_span = self.prev_token.span;
+                let mut span = self.token.span;
+                let mut count = 0;
+                while self.token.kind == TokenKind::Pound
+                    && !sm.is_multiline(span.shrink_to_hi().until(self.token.span.shrink_to_lo()))
+                {
+                    span = span.with_hi(self.token.span.hi());
+                    self.bump();
+                    count += 1;
+                }
+                err.set_span(span);
                 err.span_suggestion(
-                    self.token.span,
-                    "remove the extra `#`",
+                    span,
+                    &format!("remove the extra `#`{}", pluralize!(count)),
                     String::new(),
                     Applicability::MachineApplicable,
                 );
-                err.note(&format!("the raw string started with {n_hashes} `#`s"));
+                err.span_label(
+                    str_span,
+                    &format!("this raw string started with {n_hashes} `#`{}", pluralize!(n_hashes)),
+                );
                 true
             }
             _ => false,

compiler/rustc_serialize/src/serialize.rs

@@ -498,7 +498,6 @@ macro_rules! peel {
 /// Therefore, the recursion depth is the binary logarithm of the number of
 /// tokens to count, and the expanded tree is likewise very small.
 macro_rules! count {
-    ()                     => (0usize);
     ($one:tt)              => (1usize);
     ($($pairs:tt $_p:tt)*) => (count!($($pairs)*) << 1usize);
     ($odd:tt $($rest:tt)*) => (count!($($rest)*) | 1usize);

compiler/rustc_target/src/spec/mod.rs

@@ -2249,10 +2249,6 @@ impl ToJson for Target {
                 let name = (stringify!($attr)).replace("_", "-");
                 d.insert(name, self.$attr.to_json());
             }};
-            ($attr:ident, $key_name:expr) => {{
-                let name = $key_name;
-                d.insert(name.into(), self.$attr.to_json());
-            }};
         }
 
         macro_rules! target_option_val {

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -1727,6 +1727,7 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
         } else if cat_a == cat_b {
             match (a.kind(), b.kind()) {
                 (ty::Adt(def_a, _), ty::Adt(def_b, _)) => def_a == def_b,
+                (ty::Foreign(def_a), ty::Foreign(def_b)) => def_a == def_b,
                 // Matching on references results in a lot of unhelpful
                 // suggestions, so let's just not do that for now.
                 //

compiler/rustc_typeck/src/check/expr.rs

@@ -78,10 +78,18 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // While we don't allow *arbitrary* coercions here, we *do* allow
         // coercions from ! to `expected`.
         if ty.is_never() {
-            assert!(
-                !self.typeck_results.borrow().adjustments().contains_key(expr.hir_id),
-                "expression with never type wound up being adjusted"
-            );
+            if let Some(adjustments) = self.typeck_results.borrow().adjustments().get(expr.hir_id) {
+                self.tcx().sess.delay_span_bug(
+                    expr.span,
+                    "expression with never type wound up being adjusted",
+                );
+                return if let [Adjustment { kind: Adjust::NeverToAny, target }] = &adjustments[..] {
+                    target.to_owned()
+                } else {
+                    self.tcx().ty_error()
+                };
+            }
+
             let adj_ty = self.next_ty_var(TypeVariableOrigin {
                 kind: TypeVariableOriginKind::AdjustmentType,
                 span: expr.span,

library/alloc/src/collections/linked_list.rs

@@ -645,7 +645,7 @@ impl<T> LinkedList<T> {
     /// Returns `true` if the `LinkedList` contains an element equal to the
     /// given value.
     ///
-    /// This operation should compute in *O*(*n*) time.
+    /// This operation should compute linearly in *O*(*n*) time.
     ///
     /// # Examples
     ///
@@ -1569,7 +1569,7 @@ impl<'a, T> CursorMut<'a, T> {
     /// Appends an element to the front of the cursor's parent list. The node
     /// that the cursor points to is unchanged, even if it is the "ghost" node.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in *O*(1) time.
     // `push_front` continues to point to "ghost" when it addes a node to mimic
     // the behavior of `insert_before` on an empty list.
     #[unstable(feature = "linked_list_cursors", issue = "58533")]
@@ -1584,7 +1584,7 @@ impl<'a, T> CursorMut<'a, T> {
     /// Appends an element to the back of the cursor's parent list. The node
     /// that the cursor points to is unchanged, even if it is the "ghost" node.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in *O*(1) time.
     #[unstable(feature = "linked_list_cursors", issue = "58533")]
     pub fn push_back(&mut self, elt: T) {
         // Safety: We know that `push_back` does not change the position in
@@ -1603,7 +1603,7 @@ impl<'a, T> CursorMut<'a, T> {
     /// unchanged, unless it was pointing to the front element. In that case, it
     /// points to the new front element.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in *O*(1) time.
     #[unstable(feature = "linked_list_cursors", issue = "58533")]
     pub fn pop_front(&mut self) -> Option<T> {
         // We can't check if current is empty, we must check the list directly.
@@ -1630,7 +1630,7 @@ impl<'a, T> CursorMut<'a, T> {
     /// unchanged, unless it was pointing to the back element. In that case, it
     /// points to the "ghost" element.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in *O*(1) time.
     #[unstable(feature = "linked_list_cursors", issue = "58533")]
     pub fn pop_back(&mut self) -> Option<T> {
         if self.list.is_empty() {

library/alloc/src/collections/vec_deque/mod.rs

@@ -1342,6 +1342,12 @@ impl<T, A: Allocator> VecDeque<T, A> {
     /// Returns `true` if the deque contains an element equal to the
     /// given value.
     ///
+    /// This operation is *O*(*n*).
+    ///
+    /// Note that if you have a sorted `VecDeque`, [`binary_search`] may be faster.
+    ///
+    /// [`binary_search`]: VecDeque::binary_search
+    ///
     /// # Examples
     ///
     /// ```
@@ -2560,7 +2566,8 @@ impl<T, A: Allocator> VecDeque<T, A> {
         }
     }
 
-    /// Binary searches the sorted deque for a given element.
+    /// Binary searches this `VecDeque` for a given element.
+    /// This behaves similarly to [`contains`] if this `VecDeque` is sorted.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2570,6 +2577,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// See also [`binary_search_by`], [`binary_search_by_key`], and [`partition_point`].
     ///
+    /// [`contains`]: VecDeque::contains
     /// [`binary_search_by`]: VecDeque::binary_search_by
     /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
     /// [`partition_point`]: VecDeque::partition_point
@@ -2614,7 +2622,8 @@ impl<T, A: Allocator> VecDeque<T, A> {
         self.binary_search_by(|e| e.cmp(x))
     }
 
-    /// Binary searches the sorted deque with a comparator function.
+    /// Binary searches this `VecDeque` with a comparator function.
+    /// This behaves similarly to [`contains`] if this `VecDeque` is sorted.
     ///
     /// The comparator function should implement an order consistent
     /// with the sort order of the deque, returning an order code that
@@ -2629,6 +2638,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// See also [`binary_search`], [`binary_search_by_key`], and [`partition_point`].
     ///
+    /// [`contains`]: VecDeque::contains
     /// [`binary_search`]: VecDeque::binary_search
     /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
     /// [`partition_point`]: VecDeque::partition_point
@@ -2667,7 +2677,8 @@ impl<T, A: Allocator> VecDeque<T, A> {
         }
     }
 
-    /// Binary searches the sorted deque with a key extraction function.
+    /// Binary searches this `VecDeque` with a key extraction function.
+    /// This behaves similarly to [`contains`] if this `VecDeque` is sorted.
     ///
     /// Assumes that the deque is sorted by the key, for instance with
     /// [`make_contiguous().sort_by_key()`] using the same key extraction function.
@@ -2680,6 +2691,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// See also [`binary_search`], [`binary_search_by`], and [`partition_point`].
     ///
+    /// [`contains`]: VecDeque::contains
     /// [`make_contiguous().sort_by_key()`]: VecDeque::make_contiguous
     /// [`binary_search`]: VecDeque::binary_search
     /// [`binary_search_by`]: VecDeque::binary_search_by

library/core/src/internal_macros.rs

@@ -1,10 +1,6 @@
 // implements the unary operator "op &T"
 // based on "op T" where T is expected to be `Copy`able
 macro_rules! forward_ref_unop {
-    (impl $imp:ident, $method:ident for $t:ty) => {
-        forward_ref_unop!(impl $imp, $method for $t,
-                #[stable(feature = "rust1", since = "1.0.0")]);
-    };
     (impl const $imp:ident, $method:ident for $t:ty) => {
         forward_ref_unop!(impl const $imp, $method for $t,
                 #[stable(feature = "rust1", since = "1.0.0")]);
@@ -38,10 +34,6 @@ macro_rules! forward_ref_unop {
 // implements binary operators "&T op U", "T op &U", "&T op &U"
 // based on "T op U" where T and U are expected to be `Copy`able
 macro_rules! forward_ref_binop {
-    (impl $imp:ident, $method:ident for $t:ty, $u:ty) => {
-        forward_ref_binop!(impl $imp, $method for $t, $u,
-                #[stable(feature = "rust1", since = "1.0.0")]);
-    };
     (impl const $imp:ident, $method:ident for $t:ty, $u:ty) => {
         forward_ref_binop!(impl const $imp, $method for $t, $u,
                 #[stable(feature = "rust1", since = "1.0.0")]);
@@ -230,22 +222,6 @@ macro_rules! cfg_if {
         }
     };
 
-    // match if/else chains lacking a final `else`
-    (
-        if #[cfg( $i_meta:meta )] { $( $i_tokens:tt )* }
-        $(
-            else if #[cfg( $e_meta:meta )] { $( $e_tokens:tt )* }
-        )*
-    ) => {
-        cfg_if! {
-            @__items () ;
-            (( $i_meta ) ( $( $i_tokens )* )) ,
-            $(
-                (( $e_meta ) ( $( $e_tokens )* )) ,
-            )*
-        }
-    };
-
     // Internal and recursive macro to emit all the items
     //
     // Collects all the previous cfgs in a list at the beginning, so they can be