Rollup of 7 pull requests

compiler/rustc_ast/src/token.rs

@@ -256,10 +256,6 @@ pub enum TokenKind {
     Eof,
 }
 
-// `TokenKind` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(TokenKind, 16);
-
 #[derive(Clone, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct Token {
     pub kind: TokenKind,
@@ -752,10 +748,6 @@ pub enum Nonterminal {
     NtVis(P<ast::Visibility>),
 }
 
-// `Nonterminal` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(Nonterminal, 16);
-
 #[derive(Debug, Copy, Clone, PartialEq, Encodable, Decodable)]
 pub enum NonterminalKind {
     Item,
@@ -894,3 +886,16 @@ where
         panic!("interpolated tokens should not be present in the HIR")
     }
 }
+
+// Some types are used a lot. Make sure they don't unintentionally get bigger.
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+mod size_asserts {
+    use super::*;
+    use rustc_data_structures::static_assert_size;
+    // These are in alphabetical order, which is easy to maintain.
+    static_assert_size!(Lit, 12);
+    static_assert_size!(LitKind, 2);
+    static_assert_size!(Nonterminal, 16);
+    static_assert_size!(Token, 24);
+    static_assert_size!(TokenKind, 16);
+}

compiler/rustc_ast/src/tokenstream.rs

@@ -47,10 +47,6 @@ pub enum TokenTree {
     Delimited(DelimSpan, Delimiter, TokenStream),
 }
 
-// This type is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(TokenTree, 32);
-
 // Ensure all fields of `TokenTree` is `Send` and `Sync`.
 #[cfg(parallel_compiler)]
 fn _dummy()
@@ -308,10 +304,6 @@ pub struct AttributesData {
 #[derive(Clone, Debug, Default, Encodable, Decodable)]
 pub struct TokenStream(pub(crate) Lrc<Vec<TokenTree>>);
 
-// `TokenStream` is used a lot. Make sure it doesn't unintentionally get bigger.
-#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(TokenStream, 8);
-
 #[derive(Clone, Copy, Debug, PartialEq, Encodable, Decodable, HashStable_Generic)]
 pub enum Spacing {
     Alone,
@@ -664,3 +656,16 @@ impl DelimSpan {
         self.open.with_hi(self.close.hi())
     }
 }
+
+// Some types are used a lot. Make sure they don't unintentionally get bigger.
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+mod size_asserts {
+    use super::*;
+    use rustc_data_structures::static_assert_size;
+    // These are in alphabetical order, which is easy to maintain.
+    static_assert_size!(AttrTokenStream, 8);
+    static_assert_size!(AttrTokenTree, 32);
+    static_assert_size!(LazyAttrTokenStream, 8);
+    static_assert_size!(TokenStream, 8);
+    static_assert_size!(TokenTree, 32);
+}

compiler/rustc_ast_lowering/src/lib.rs

@@ -61,8 +61,8 @@ use rustc_hir::def_id::{LocalDefId, CRATE_DEF_ID};
 use rustc_hir::definitions::DefPathData;
 use rustc_hir::{ConstArg, GenericArg, ItemLocalId, ParamName, TraitCandidate};
 use rustc_index::vec::{Idx, IndexVec};
-use rustc_middle::span_bug;
 use rustc_middle::ty::{ResolverAstLowering, TyCtxt};
+use rustc_middle::{bug, span_bug};
 use rustc_session::parse::feature_err;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::source_map::DesugaringKind;
@@ -1060,13 +1060,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                     // Desugar `AssocTy: Bounds` into `AssocTy = impl Bounds`. We do this by
                     // constructing the HIR for `impl bounds...` and then lowering that.
 
-                    let parent_def_id = self.current_hir_id_owner;
                     let impl_trait_node_id = self.next_node_id();
-                    self.create_def(
-                        parent_def_id.def_id,
-                        impl_trait_node_id,
-                        DefPathData::ImplTrait,
-                    );
 
                     self.with_dyn_type_scope(false, |this| {
                         let node_id = this.next_node_id();
@@ -1357,9 +1351,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                         def_node_id,
                         bounds,
                         false,
-                        &ImplTraitContext::TypeAliasesOpaqueTy,
+                        itctx,
                     ),
                     ImplTraitContext::Universal => {
+                        self.create_def(
+                            self.current_hir_id_owner.def_id,
+                            def_node_id,
+                            DefPathData::ImplTrait,
+                        );
                         let span = t.span;
                         let ident = Ident::from_str_and_span(&pprust::ty_to_string(t), span);
                         let (param, bounds, path) =
@@ -1453,7 +1452,17 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         // frequently opened issues show.
         let opaque_ty_span = self.mark_span_with_reason(DesugaringKind::OpaqueTy, span, None);
 
-        let opaque_ty_def_id = self.local_def_id(opaque_ty_node_id);
+        let opaque_ty_def_id = match origin {
+            hir::OpaqueTyOrigin::TyAlias => self.create_def(
+                self.current_hir_id_owner.def_id,
+                opaque_ty_node_id,
+                DefPathData::ImplTrait,
+            ),
+            hir::OpaqueTyOrigin::FnReturn(fn_def_id) => {
+                self.create_def(fn_def_id, opaque_ty_node_id, DefPathData::ImplTrait)
+            }
+            hir::OpaqueTyOrigin::AsyncFn(..) => bug!("unreachable"),
+        };
         debug!(?opaque_ty_def_id);
 
         // Contains the new lifetime definitions created for the TAIT (if any).

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -864,15 +864,13 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
         };
 
         let tcx = self.infcx.tcx;
-        let body_parent_did = tcx.opt_parent(self.mir_def_id().to_def_id())?;
-        if tcx.parent(region.def_id) != body_parent_did
-            || tcx.def_kind(body_parent_did) != DefKind::Impl
-        {
+        let region_parent = tcx.parent(region.def_id);
+        if tcx.def_kind(region_parent) != DefKind::Impl {
             return None;
         }
 
         let mut found = false;
-        tcx.fold_regions(tcx.type_of(body_parent_did), |r: ty::Region<'tcx>, _| {
+        tcx.fold_regions(tcx.type_of(region_parent), |r: ty::Region<'tcx>, _| {
             if *r == ty::ReEarlyBound(region) {
                 found = true;
             }

compiler/rustc_errors/src/lib.rs

@@ -66,7 +66,7 @@ pub type PErr<'a> = DiagnosticBuilder<'a, ErrorGuaranteed>;
 pub type PResult<'a, T> = Result<T, PErr<'a>>;
 
 // `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
-// (See also the comment on `DiagnosticBuilder`'s `diagnostic` field.)
+// (See also the comment on `DiagnosticBuilderInner`'s `diagnostic` field.)
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 rustc_data_structures::static_assert_size!(PResult<'_, ()>, 16);
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
@@ -1134,6 +1134,12 @@ impl Handler {
         );
         std::mem::take(&mut self.inner.borrow_mut().fulfilled_expectations)
     }
+
+    pub fn flush_delayed(&self) {
+        let mut inner = self.inner.lock();
+        let bugs = std::mem::replace(&mut inner.delayed_span_bugs, Vec::new());
+        inner.flush_delayed(bugs, "no errors encountered even though `delay_span_bug` issued");
+    }
 }
 
 impl HandlerInner {

compiler/rustc_hir_analysis/src/astconv/generics.rs

@@ -448,8 +448,8 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         let infer_lifetimes =
             (gen_pos != GenericArgPosition::Type || infer_args) && !gen_args.has_lifetime_params();
 
-        if gen_pos != GenericArgPosition::Type && !gen_args.bindings.is_empty() {
-            Self::prohibit_assoc_ty_binding(tcx, gen_args.bindings[0].span);
+        if gen_pos != GenericArgPosition::Type && let Some(b) = gen_args.bindings.first() {
+            Self::prohibit_assoc_ty_binding(tcx, b.span);
         }
 
         let explicit_late_bound =

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -276,9 +276,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             item_segment.infer_args,
             None,
         );
-        let assoc_bindings = self.create_assoc_bindings_for_generic_args(item_segment.args());
-
-        if let Some(b) = assoc_bindings.first() {
+        if let Some(b) = item_segment.args().bindings.first() {
             Self::prohibit_assoc_ty_binding(self.tcx(), b.span);
         }
 
@@ -605,8 +603,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             None,
         );
 
-        let assoc_bindings = self.create_assoc_bindings_for_generic_args(item_segment.args());
-        if let Some(b) = assoc_bindings.first() {
+        if let Some(b) = item_segment.args().bindings.first() {
             Self::prohibit_assoc_ty_binding(self.tcx(), b.span);
         }
 
@@ -794,8 +791,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             trait_segment,
             is_impl,
         );
-        let assoc_bindings = self.create_assoc_bindings_for_generic_args(trait_segment.args());
-        if let Some(b) = assoc_bindings.first() {
+        if let Some(b) = trait_segment.args().bindings.first() {
             Self::prohibit_assoc_ty_binding(self.tcx(), b.span);
         }
         ty::TraitRef::new(trait_def_id, substs)
@@ -2207,8 +2203,8 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
         for segment in segments {
             // Only emit the first error to avoid overloading the user with error messages.
-            if let [binding, ..] = segment.args().bindings {
-                Self::prohibit_assoc_ty_binding(self.tcx(), binding.span);
+            if let Some(b) = segment.args().bindings.first() {
+                Self::prohibit_assoc_ty_binding(self.tcx(), b.span);
                 return true;
             }
         }

compiler/rustc_interface/src/queries.rs

@@ -246,6 +246,10 @@ impl<'tcx> Queries<'tcx> {
                 // Don't do code generation if there were any errors
                 self.session().compile_status()?;
 
+                // If we have any delayed bugs, for example because we created TyKind::Error earlier,
+                // it's likely that codegen will only cause more ICEs, obscuring the original problem
+                self.session().diagnostic().flush_delayed();
+
                 // Hook for UI tests.
                 Self::check_for_rustc_errors_attr(tcx);
 

compiler/rustc_middle/src/hir/map/mod.rs

@@ -14,7 +14,7 @@ use rustc_index::vec::Idx;
 use rustc_middle::hir::nested_filter;
 use rustc_span::def_id::StableCrateId;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
-use rustc_span::Span;
+use rustc_span::{Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
 
 #[inline]
@@ -1131,7 +1131,7 @@ pub(super) fn crate_hash(tcx: TyCtxt<'_>, crate_num: CrateNum) -> Svh {
                 .filter_map(|(def_id, info)| {
                     let _ = info.as_owner()?;
                     let def_path_hash = definitions.def_path_hash(def_id);
-                    let span = resolutions.source_span[def_id];
+                    let span = resolutions.source_span.get(def_id).unwrap_or(&DUMMY_SP);
                     debug_assert_eq!(span.parent(), None);
                     Some((def_path_hash, span))
                 })

compiler/rustc_parse/src/parser/attr_wrapper.rs

@@ -32,11 +32,6 @@ pub struct AttrWrapper {
     start_pos: usize,
 }
 
-// This struct is passed around very frequently,
-// so make sure it doesn't accidentally get larger
-#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(AttrWrapper, 16);
-
 impl AttrWrapper {
     pub(super) fn new(attrs: AttrVec, start_pos: usize) -> AttrWrapper {
         AttrWrapper { attrs, start_pos }
@@ -96,9 +91,6 @@ struct LazyAttrTokenStreamImpl {
     replace_ranges: Box<[ReplaceRange]>,
 }
 
-#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(LazyAttrTokenStreamImpl, 144);
-
 impl ToAttrTokenStream for LazyAttrTokenStreamImpl {
     fn to_attr_token_stream(&self) -> AttrTokenStream {
         // The token produced by the final call to `{,inlined_}next` was not
@@ -461,3 +453,13 @@ fn make_token_stream(
     }
     AttrTokenStream::new(final_buf.inner)
 }
+
+// Some types are used a lot. Make sure they don't unintentionally get bigger.
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+mod size_asserts {
+    use super::*;
+    use rustc_data_structures::static_assert_size;
+    // These are in alphabetical order, which is easy to maintain.
+    static_assert_size!(AttrWrapper, 16);
+    static_assert_size!(LazyAttrTokenStreamImpl, 144);
+}

compiler/rustc_passes/src/check_const.rs

@@ -198,8 +198,8 @@ impl<'tcx> Visitor<'tcx> for CheckConstVisitor<'tcx> {
             of_trait: Some(trait_ref),
             ..
         }) = item.kind
+            && let Some(def_id) = trait_ref.trait_def_id()
         {
-            let def_id = trait_ref.trait_def_id().unwrap();
             let source_map = tcx.sess.source_map();
             if !tcx.has_attr(def_id, sym::const_trait) {
                 tcx.sess

compiler/rustc_query_system/src/ich/hcx.rs

@@ -12,7 +12,7 @@ use rustc_session::cstore::CrateStore;
 use rustc_session::Session;
 use rustc_span::source_map::SourceMap;
 use rustc_span::symbol::Symbol;
-use rustc_span::{BytePos, CachingSourceMapView, SourceFile, Span, SpanData};
+use rustc_span::{BytePos, CachingSourceMapView, SourceFile, Span, SpanData, DUMMY_SP};
 
 /// This is the context state available during incr. comp. hashing. It contains
 /// enough information to transform `DefId`s and `HirId`s into stable `DefPath`s (i.e.,
@@ -185,7 +185,7 @@ impl<'a> rustc_span::HashStableContext for StableHashingContext<'a> {
 
     #[inline]
     fn def_span(&self, def_id: LocalDefId) -> Span {
-        self.source_span[def_id]
+        *self.source_span.get(def_id).unwrap_or(&DUMMY_SP)
     }
 
     #[inline]

compiler/rustc_resolve/src/def_collector.rs

@@ -285,21 +285,6 @@ impl<'a, 'b> visit::Visitor<'a> for DefCollector<'a, 'b> {
     fn visit_ty(&mut self, ty: &'a Ty) {
         match ty.kind {
             TyKind::MacCall(..) => self.visit_macro_invoc(ty.id),
-            TyKind::ImplTrait(node_id, _) => {
-                let parent_def = match self.impl_trait_context {
-                    ImplTraitContext::Universal(item_def) => self.resolver.create_def(
-                        item_def,
-                        node_id,
-                        DefPathData::ImplTrait,
-                        self.expansion.to_expn_id(),
-                        ty.span,
-                    ),
-                    ImplTraitContext::Existential => {
-                        self.create_def(node_id, DefPathData::ImplTrait, ty.span)
-                    }
-                };
-                self.with_parent(parent_def, |this| visit::walk_ty(this, ty))
-            }
             _ => visit::walk_ty(self, ty),
         }
     }

src/librustdoc/html/render/print_item.rs

@@ -718,7 +718,7 @@ fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean:
         if toggled {
             write!(w, "<details class=\"rustdoc-toggle method-toggle\" open><summary>");
         }
-        write!(w, "<div id=\"{}\" class=\"method has-srclink\">", id);
+        write!(w, "<section id=\"{}\" class=\"method has-srclink\">", id);
         render_rightside(w, cx, m, t, RenderMode::Normal);
         write!(w, "<h4 class=\"code-header\">");
         render_assoc_item(
@@ -730,7 +730,7 @@ fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean:
             RenderMode::Normal,
         );
         w.write_str("</h4>");
-        w.write_str("</div>");
+        w.write_str("</section>");
         if toggled {
             write!(w, "</summary>");
             w.push_buffer(content);

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

@@ -2006,7 +2006,10 @@ in storage.js plus the media query with (min-width: 701px)
 .method-toggle summary,
 .implementors-toggle summary,
 .impl,
-#implementors-list > .docblock {
+#implementors-list > .docblock,
+.impl-items > section,
+.methods > section
+{
 	margin-bottom: 0.75em;
 }
 

src/test/rustdoc-gui/no-docblock.goml

@@ -0,0 +1,8 @@
+// This test checks that there are margins applied to methods with no docblocks.
+goto: file://|DOC_PATH|/test_docs/trait.TraitWithNoDocblocks.html
+// Check that the two methods are more than 24px apart.
+compare-elements-position-near-false: ("//*[@id='tymethod.first_fn']", "//*[@id='tymethod.second_fn']", {"y": 24})
+
+goto: file://|DOC_PATH|/test_docs/struct.TypeWithNoDocblocks.html
+// Check that the two methods are more than 24px apart.
+compare-elements-position-near-false: ("//*[@id='method.first_fn']", "//*[@id='method.second_fn']", {"y": 24})