Auto merge of rust-lang#103502 - JohnTitor:rollup-o6mhyzq, r=JohnTitor

Rollup of 11 pull requests

Successful merges:

 - rust-lang#103333 (Fix assertion failed for break_last_token and trailing token)
 - rust-lang#103350 (Change terminology for assoc method suggestions when they are not called)
 - rust-lang#103382 (Don't ICE when reporting borrowck errors involving regions from `anonymous_lifetime_in_impl_trait`)
 - rust-lang#103409 (Delay span bug when we can't map lifetimes back in `collect_trait_impl_trait_tys`)
 - rust-lang#103410 (-Z docs: Add link to unstable book)
 - rust-lang#103462 (rustdoc: remove no-op CSS `.source pre.rust { white-space: pre }`)
 - rust-lang#103465 (E0210 explanation: remove redundant sentence)
 - rust-lang#103486 (Use functions in highlight-colors rustdoc GUI test)
 - rust-lang#103493 (rustdoc: remove unused `.sidebar-logo` DOM on source pages)
 - rust-lang#103494 (rustdoc: remove redundant CSS `a.test-arrow:hover`)
 - rust-lang#103495 (rustdoc: Use `unix_sigpipe` instead of `rustc_driver::set_sigpipe_handler`)

Failed merges:

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

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -251,7 +251,8 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
             .or_else(|| self.give_name_if_anonymous_region_appears_in_upvars(fr))
             .or_else(|| self.give_name_if_anonymous_region_appears_in_output(fr))
             .or_else(|| self.give_name_if_anonymous_region_appears_in_yield_ty(fr))
-            .or_else(|| self.give_name_if_anonymous_region_appears_in_impl_signature(fr));
+            .or_else(|| self.give_name_if_anonymous_region_appears_in_impl_signature(fr))
+            .or_else(|| self.give_name_if_anonymous_region_appears_in_arg_position_impl_trait(fr));
 
         if let Some(ref value) = value {
             self.region_names.try_borrow_mut().unwrap().insert(fr, value.clone());
@@ -869,13 +870,8 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
             return None;
         }
 
-        let mut found = false;
-        tcx.fold_regions(tcx.type_of(region_parent), |r: ty::Region<'tcx>, _| {
-            if *r == ty::ReEarlyBound(region) {
-                found = true;
-            }
-            r
-        });
+        let found = tcx
+            .any_free_region_meets(&tcx.type_of(region_parent), |r| *r == ty::ReEarlyBound(region));
 
         Some(RegionName {
             name: self.synthesize_region_name(),
@@ -888,4 +884,92 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
             ),
         })
     }
+
+    fn give_name_if_anonymous_region_appears_in_arg_position_impl_trait(
+        &self,
+        fr: RegionVid,
+    ) -> Option<RegionName> {
+        let ty::ReEarlyBound(region) = *self.to_error_region(fr)? else {
+            return None;
+        };
+        if region.has_name() {
+            return None;
+        };
+
+        let predicates = self
+            .infcx
+            .tcx
+            .predicates_of(self.body.source.def_id())
+            .instantiate_identity(self.infcx.tcx)
+            .predicates;
+
+        if let Some(upvar_index) = self
+            .regioncx
+            .universal_regions()
+            .defining_ty
+            .upvar_tys()
+            .position(|ty| self.any_param_predicate_mentions(&predicates, ty, region))
+        {
+            let (upvar_name, upvar_span) = self.regioncx.get_upvar_name_and_span_for_region(
+                self.infcx.tcx,
+                &self.upvars,
+                upvar_index,
+            );
+            let region_name = self.synthesize_region_name();
+
+            Some(RegionName {
+                name: region_name,
+                source: RegionNameSource::AnonRegionFromUpvar(upvar_span, upvar_name),
+            })
+        } else if let Some(arg_index) = self
+            .regioncx
+            .universal_regions()
+            .unnormalized_input_tys
+            .iter()
+            .position(|ty| self.any_param_predicate_mentions(&predicates, *ty, region))
+        {
+            let (arg_name, arg_span) = self.regioncx.get_argument_name_and_span_for_region(
+                self.body,
+                &self.local_names,
+                arg_index,
+            );
+            let region_name = self.synthesize_region_name();
+
+            Some(RegionName {
+                name: region_name,
+                source: RegionNameSource::AnonRegionFromArgument(
+                    RegionNameHighlight::CannotMatchHirTy(arg_span, arg_name?.to_string()),
+                ),
+            })
+        } else {
+            None
+        }
+    }
+
+    fn any_param_predicate_mentions(
+        &self,
+        predicates: &[ty::Predicate<'tcx>],
+        ty: Ty<'tcx>,
+        region: ty::EarlyBoundRegion,
+    ) -> bool {
+        let tcx = self.infcx.tcx;
+        ty.walk().any(|arg| {
+            if let ty::GenericArgKind::Type(ty) = arg.unpack()
+                && let ty::Param(_) = ty.kind()
+            {
+                predicates.iter().any(|pred| {
+                    match pred.kind().skip_binder() {
+                        ty::PredicateKind::Trait(data) if data.self_ty() == ty => {}
+                        ty::PredicateKind::Projection(data) if data.projection_ty.self_ty() == ty => {}
+                        _ => return false,
+                    }
+                    tcx.any_free_region_meets(pred, |r| {
+                        *r == ty::ReEarlyBound(region)
+                    })
+                })
+            } else {
+                false
+            }
+        })
+    }
 }

compiler/rustc_error_codes/src/error_codes/E0210.md

@@ -76,7 +76,5 @@ Let `Ti` be the first such type.
 For information on the design of the orphan rules,
 see [RFC 2451] and [RFC 1023].
 
-For information on the design of the orphan rules, see [RFC 1023].
-
 [RFC 2451]: https://rust-lang.github.io/rfcs/2451-re-rebalancing-coherence.html
 [RFC 1023]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md

compiler/rustc_hir_analysis/src/check/compare_method.rs

@@ -598,8 +598,16 @@ pub fn collect_trait_impl_trait_tys<'tcx>(
                 let num_impl_substs = tcx.generics_of(impl_m.container_id(tcx)).params.len();
                 let ty = tcx.fold_regions(ty, |region, _| {
                     let ty::ReFree(_) = region.kind() else { return region; };
-                    let ty::ReEarlyBound(e) = map[&region.into()].expect_region().kind()
-                        else { bug!("expected ReFree to map to ReEarlyBound"); };
+                    let Some(ty::ReEarlyBound(e)) = map.get(&region.into()).map(|r| r.expect_region().kind())
+                    else {
+                        tcx
+                            .sess
+                            .delay_span_bug(
+                                return_span,
+                                "expected ReFree to map to ReEarlyBound"
+                            );
+                        return tcx.lifetimes.re_static;
+                    };
                     tcx.mk_region(ty::ReEarlyBound(ty::EarlyBoundRegion {
                         def_id: e.def_id,
                         name: e.name,

compiler/rustc_parse/src/parser/attr_wrapper.rs

@@ -273,16 +273,23 @@ impl<'a> Parser<'a> {
         let cursor_snapshot_next_calls = cursor_snapshot.num_next_calls;
         let mut end_pos = self.token_cursor.num_next_calls;
 
+        let mut captured_trailing = false;
+
         // Capture a trailing token if requested by the callback 'f'
         match trailing {
             TrailingToken::None => {}
+            TrailingToken::Gt => {
+                assert_eq!(self.token.kind, token::Gt);
+            }
             TrailingToken::Semi => {
                 assert_eq!(self.token.kind, token::Semi);
                 end_pos += 1;
+                captured_trailing = true;
             }
             TrailingToken::MaybeComma => {
                 if self.token.kind == token::Comma {
                     end_pos += 1;
+                    captured_trailing = true;
                 }
             }
         }
@@ -292,11 +299,7 @@ impl<'a> Parser<'a> {
         // was not actually bumped past it. When the `LazyAttrTokenStream` gets converted
         // into an `AttrTokenStream`, we will create the proper token.
         if self.token_cursor.break_last_token {
-            assert_eq!(
-                trailing,
-                TrailingToken::None,
-                "Cannot set `break_last_token` and have trailing token"
-            );
+            assert!(!captured_trailing, "Cannot set break_last_token and have trailing token");
             end_pos += 1;
         }
 

compiler/rustc_parse/src/parser/expr.rs

@@ -3142,6 +3142,8 @@ impl<'a> Parser<'a> {
                 && this.token.kind == token::Semi
             {
                 TrailingToken::Semi
+            } else if this.token.kind == token::Gt {
+                TrailingToken::Gt
             } else {
                 // FIXME - pass this through from the place where we know
                 // we need a comma, rather than assuming that `#[attr] expr,`

compiler/rustc_parse/src/parser/mod.rs

@@ -79,6 +79,7 @@ pub enum ForceCollect {
 pub enum TrailingToken {
     None,
     Semi,
+    Gt,
     /// If the trailing token is a comma, then capture it
     /// Otherwise, ignore the trailing token
     MaybeComma,

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -38,8 +38,8 @@ type Res = def::Res<ast::NodeId>;
 /// A field or associated item from self type suggested in case of resolution failure.
 enum AssocSuggestion {
     Field,
-    MethodWithSelf,
-    AssocFn,
+    MethodWithSelf { called: bool },
+    AssocFn { called: bool },
     AssocType,
     AssocConst,
 }
@@ -48,8 +48,14 @@ impl AssocSuggestion {
     fn action(&self) -> &'static str {
         match self {
             AssocSuggestion::Field => "use the available field",
-            AssocSuggestion::MethodWithSelf => "call the method with the fully-qualified path",
-            AssocSuggestion::AssocFn => "call the associated function",
+            AssocSuggestion::MethodWithSelf { called: true } => {
+                "call the method with the fully-qualified path"
+            }
+            AssocSuggestion::MethodWithSelf { called: false } => {
+                "refer to the method with the fully-qualified path"
+            }
+            AssocSuggestion::AssocFn { called: true } => "call the associated function",
+            AssocSuggestion::AssocFn { called: false } => "refer to the associated function",
             AssocSuggestion::AssocConst => "use the associated `const`",
             AssocSuggestion::AssocType => "use the associated type",
         }
@@ -516,7 +522,9 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
         let typo_sugg =
             self.lookup_typo_candidate(path, source.namespace(), is_expected).to_opt_suggestion();
         if path.len() == 1 && self.self_type_is_available() {
-            if let Some(candidate) = self.lookup_assoc_candidate(ident, ns, is_expected) {
+            if let Some(candidate) =
+                self.lookup_assoc_candidate(ident, ns, is_expected, source.is_call())
+            {
                 let self_is_available = self.self_value_is_available(path[0].ident.span);
                 match candidate {
                     AssocSuggestion::Field => {
@@ -531,16 +539,21 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                             err.span_label(span, "a field by this name exists in `Self`");
                         }
                     }
-                    AssocSuggestion::MethodWithSelf if self_is_available => {
+                    AssocSuggestion::MethodWithSelf { called } if self_is_available => {
+                        let msg = if called {
+                            "you might have meant to call the method"
+                        } else {
+                            "you might have meant to refer to the method"
+                        };
                         err.span_suggestion(
                             span,
-                            "you might have meant to call the method",
+                            msg,
                             format!("self.{path_str}"),
                             Applicability::MachineApplicable,
                         );
                     }
-                    AssocSuggestion::MethodWithSelf
-                    | AssocSuggestion::AssocFn
+                    AssocSuggestion::MethodWithSelf { .. }
+                    | AssocSuggestion::AssocFn { .. }
                     | AssocSuggestion::AssocConst
                     | AssocSuggestion::AssocType => {
                         err.span_suggestion(
@@ -1498,6 +1511,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
         ident: Ident,
         ns: Namespace,
         filter_fn: FilterFn,
+        called: bool,
     ) -> Option<AssocSuggestion>
     where
         FilterFn: Fn(Res) -> bool,
@@ -1539,9 +1553,9 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                     return Some(match &assoc_item.kind {
                         ast::AssocItemKind::Const(..) => AssocSuggestion::AssocConst,
                         ast::AssocItemKind::Fn(box ast::Fn { sig, .. }) if sig.decl.has_self() => {
-                            AssocSuggestion::MethodWithSelf
+                            AssocSuggestion::MethodWithSelf { called }
                         }
-                        ast::AssocItemKind::Fn(..) => AssocSuggestion::AssocFn,
+                        ast::AssocItemKind::Fn(..) => AssocSuggestion::AssocFn { called },
                         ast::AssocItemKind::Type(..) => AssocSuggestion::AssocType,
                         ast::AssocItemKind::MacCall(_) => continue,
                     });
@@ -1560,10 +1574,12 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                 let res = binding.res();
                 if filter_fn(res) {
                     if self.r.has_self.contains(&res.def_id()) {
-                        return Some(AssocSuggestion::MethodWithSelf);
+                        return Some(AssocSuggestion::MethodWithSelf { called });
                     } else {
                         match res {
-                            Res::Def(DefKind::AssocFn, _) => return Some(AssocSuggestion::AssocFn),
+                            Res::Def(DefKind::AssocFn, _) => {
+                                return Some(AssocSuggestion::AssocFn { called });
+                            }
                             Res::Def(DefKind::AssocConst, _) => {
                                 return Some(AssocSuggestion::AssocConst);
                             }

src/doc/rustc/src/command-line-arguments.md

@@ -302,7 +302,7 @@ _Note:_ The order of these lint level arguments is taken into account, see [lint
 This flag will allow you to set unstable options of rustc. In order to set multiple options,
 the -Z flag can be used multiple times. For example: `rustc -Z verbose -Z time-passes`.
 Specifying options with -Z is only available on nightly. To view all available options
-run: `rustc -Z help`.
+run: `rustc -Z help`, or see [The Unstable Book](../unstable-book/index.html).
 
 <a id="option-cap-lints"></a>
 ## `--cap-lints`: set the most restrictive lint level

src/librustdoc/html/static/css/noscript.css

@@ -18,3 +18,7 @@ nav.sub {
 	/* The search bar and related controls don't work without JS */
 	display: none;
 }
+
+.source .sidebar {
+	display: none;
+}

src/librustdoc/html/static/css/rustdoc.css

@@ -402,10 +402,6 @@ img {
 	overflow-y: hidden;
 }
 
-.rustdoc.source .sidebar .sidebar-logo {
-	display: none;
-}
-
 .source .sidebar, #sidebar-toggle, #source-sidebar {
 	background-color: var(--sidebar-background-color);
 }
@@ -538,7 +534,6 @@ ul.block, .block li {
 }
 
 .source .content pre.rust {
-	white-space: pre;
 	overflow: auto;
 	padding-left: 0;
 }
@@ -1233,9 +1228,6 @@ a.test-arrow {
 .example-wrap:hover .test-arrow {
 	visibility: visible;
 }
-a.test-arrow:hover {
-	text-decoration: none;
-}
 
 .code-attribute {
 	font-weight: 300;

src/librustdoc/html/templates/page.html

@@ -89,6 +89,7 @@ <h2></h2> {#- -#}
     </nav> {#- -#}
     {%- endif -%}
     <nav class="sidebar"> {#- -#}
+        {%- if page.css_class != "source" -%}
         <a class="sidebar-logo" href="{{page.root_path|safe}}{{krate_with_trailing_slash|safe}}index.html"> {#- -#}
             <div class="logo-container"> {#- -#}
                 {%- if !layout.logo.is_empty()  %}
@@ -98,6 +99,7 @@ <h2></h2> {#- -#}
                 {%- endif -%}
             </div> {#- -#}
         </a> {#- -#}
+        {%- endif -%}
         {{- sidebar|safe -}}
     </nav> {#- -#}
     <main> {#- -#}

src/librustdoc/lib.rs

@@ -154,7 +154,6 @@ pub fn main() {
         }
     }
 
-    rustc_driver::set_sigpipe_handler();
     rustc_driver::install_ice_hook();
 
     // When using CI artifacts (with `download_stage1 = true`), tracing is unconditionally built