Auto merge of #66141 - Centril:rollup-n2fcvp9, r=Centril

Rollup of 11 pull requests

Successful merges:

 - #65892 (Remove `PartialEq` and `Eq` from the `SpecialDerives`.)
 - #66014 (Show type parameter name and definition in type mismatch error messages )
 - #66027 (Move has_panic_handler to query)
 - #66054 (syntax: Avoid span arithmetic for delimiter tokens)
 - #66068 (use silent emitter for rustdoc highlighting pass)
 - #66081 (let caller of check_ptr_access_align control the error message)
 - #66093 (Do not ICE with a precision flag in formatting str and no format arguments)
 - #66098 (Detect `::` -> `:` typo when involving turbofish)
 - #66101 (Tweak type mismatch caused by break on tail expr)
 - #66106 (Fix typo in explanation of `E0080`)
 - #66115 (rustc: remove "GlobalMetaData" dead code from hir::map::definitions.)

Failed merges:

r? @ghost

6 files changed, 26 insertions, 32 deletions

diff --git a/src/libsyntax/expand/mod.rs b/src/libsyntax/expand/mod.rs
index 038f60287be..03b30fda745 100644
--- a/src/libsyntax/expand/mod.rs
+++ b/src/libsyntax/expand/mod.rs
@@ -5,16 +5,6 @@ use syntax_pos::symbol::sym;
 
 pub mod allocator;
 
-bitflags::bitflags! {
-    /// Built-in derives that need some extra tracking beyond the usual macro functionality.
-    #[derive(Default)]
-    pub struct SpecialDerives: u8 {
-        const PARTIAL_EQ = 1 << 0;
-        const EQ         = 1 << 1;
-        const COPY       = 1 << 2;
-    }
-}
-
 pub fn is_proc_macro_attr(attr: &Attribute) -> bool {
     [sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
         .iter().any(|kind| attr.check_name(*kind))
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index e81d4573b73..7652c730e51 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -209,12 +209,12 @@ impl TokenCursor {
         loop {
             let tree = if !self.frame.open_delim {
                 self.frame.open_delim = true;
-                TokenTree::open_tt(self.frame.span.open, self.frame.delim)
+                TokenTree::open_tt(self.frame.span, self.frame.delim)
             } else if let Some(tree) = self.frame.tree_cursor.next() {
                 tree
             } else if !self.frame.close_delim {
                 self.frame.close_delim = true;
-                TokenTree::close_tt(self.frame.span.close, self.frame.delim)
+                TokenTree::close_tt(self.frame.span, self.frame.delim)
             } else if let Some(frame) = self.stack.pop() {
                 self.frame = frame;
                 continue
diff --git a/src/libsyntax/parse/parser/diagnostics.rs b/src/libsyntax/parse/parser/diagnostics.rs
index fcf3b4c0aa8..453ef5963be 100644
--- a/src/libsyntax/parse/parser/diagnostics.rs
+++ b/src/libsyntax/parse/parser/diagnostics.rs
@@ -360,11 +360,11 @@ impl<'a> Parser<'a> {
     }
 
     pub fn maybe_annotate_with_ascription(
-        &self,
+        &mut self,
         err: &mut DiagnosticBuilder<'_>,
         maybe_expected_semicolon: bool,
     ) {
-        if let Some((sp, likely_path)) = self.last_type_ascription {
+        if let Some((sp, likely_path)) = self.last_type_ascription.take() {
             let sm = self.sess.source_map();
             let next_pos = sm.lookup_char_pos(self.token.span.lo());
             let op_pos = sm.lookup_char_pos(sp.hi());
@@ -1088,8 +1088,15 @@ impl<'a> Parser<'a> {
     }
 
     pub(super) fn could_ascription_be_path(&self, node: &ast::ExprKind) -> bool {
-        self.token.is_ident() &&
-            if let ast::ExprKind::Path(..) = node { true } else { false } &&
+        (self.token == token::Lt && // `foo:<bar`, likely a typoed turbofish.
+            self.look_ahead(1, |t| t.is_ident() && !t.is_reserved_ident())
+        ) ||
+            self.token.is_ident() &&
+            match node {
+                // `foo::` → `foo:` or `foo.bar::` → `foo.bar:`
+                ast::ExprKind::Path(..) | ast::ExprKind::Field(..) => true,
+                _ => false,
+            } &&
             !self.token.is_reserved_ident() &&           // v `foo:bar(baz)`
             self.look_ahead(1, |t| t == &token::OpenDelim(token::Paren)) ||
             self.look_ahead(1, |t| t == &token::Lt) &&     // `foo:bar<baz`
diff --git a/src/libsyntax/parse/parser/stmt.rs b/src/libsyntax/parse/parser/stmt.rs
index 4f51fefe66f..12c530f3cbb 100644
--- a/src/libsyntax/parse/parser/stmt.rs
+++ b/src/libsyntax/parse/parser/stmt.rs
@@ -397,6 +397,7 @@ impl<'a> Parser<'a> {
             }
             let stmt = match self.parse_full_stmt(false) {
                 Err(mut err) => {
+                    self.maybe_annotate_with_ascription(&mut err, false);
                     err.emit();
                     self.recover_stmt_(SemiColonMode::Ignore, BlockMode::Ignore);
                     Some(Stmt {
diff --git a/src/libsyntax/sess.rs b/src/libsyntax/sess.rs
index 323fe01f067..30f8c56a056 100644
--- a/src/libsyntax/sess.rs
+++ b/src/libsyntax/sess.rs
@@ -6,7 +6,7 @@ use crate::early_buffered_lints::{BufferedEarlyLint, BufferedEarlyLintId};
 use crate::source_map::{SourceMap, FilePathMapping};
 use crate::feature_gate::UnstableFeatures;
 
-use errors::{Applicability, Handler, ColorConfig, DiagnosticBuilder};
+use errors::{Applicability, emitter::SilentEmitter, Handler, ColorConfig, DiagnosticBuilder};
 use rustc_data_structures::fx::{FxHashSet, FxHashMap};
 use rustc_data_structures::sync::{Lrc, Lock, Once};
 use syntax_pos::{Symbol, Span, MultiSpan};
@@ -107,6 +107,12 @@ impl ParseSess {
         }
     }
 
+    pub fn with_silent_emitter() -> Self {
+        let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
+        let handler = Handler::with_emitter(false, None, Box::new(SilentEmitter));
+        ParseSess::with_span_handler(handler, cm)
+    }
+
     #[inline]
     pub fn source_map(&self) -> &SourceMap {
         &self.source_map
diff --git a/src/libsyntax/tokenstream.rs b/src/libsyntax/tokenstream.rs
index 0559f224f1f..7e0582797c7 100644
--- a/src/libsyntax/tokenstream.rs
+++ b/src/libsyntax/tokenstream.rs
@@ -15,7 +15,7 @@
 
 use crate::parse::token::{self, DelimToken, Token, TokenKind};
 
-use syntax_pos::{BytePos, Span, DUMMY_SP};
+use syntax_pos::{Span, DUMMY_SP};
 #[cfg(target_arch = "x86_64")]
 use rustc_data_structures::static_assert_size;
 use rustc_data_structures::sync::Lrc;
@@ -110,23 +110,13 @@ impl TokenTree {
     }
 
     /// Returns the opening delimiter as a token tree.
-    pub fn open_tt(span: Span, delim: DelimToken) -> TokenTree {
-        let open_span = if span.is_dummy() {
-            span
-        } else {
-            span.with_hi(span.lo() + BytePos(delim.len() as u32))
-        };
-        TokenTree::token(token::OpenDelim(delim), open_span)
+    pub fn open_tt(span: DelimSpan, delim: DelimToken) -> TokenTree {
+        TokenTree::token(token::OpenDelim(delim), span.open)
     }
 
     /// Returns the closing delimiter as a token tree.
-    pub fn close_tt(span: Span, delim: DelimToken) -> TokenTree {
-        let close_span = if span.is_dummy() {
-            span
-        } else {
-            span.with_lo(span.hi() - BytePos(delim.len() as u32))
-        };
-        TokenTree::token(token::CloseDelim(delim), close_span)
+    pub fn close_tt(span: DelimSpan, delim: DelimToken) -> TokenTree {
+        TokenTree::token(token::CloseDelim(delim), span.close)
     }
 }