Auto merge of #69144 - Dylan-DPC:rollup-apt6zjj, r=Dylan-DPC

Rollup of 9 pull requests

Successful merges:

 - #68728 (parse: merge `fn` syntax + cleanup item parsing)
 - #68938 (fix lifetime shadowing check in GATs)
 - #69057 (expand: misc cleanups and simplifications)
 - #69108 (Use HirId in TraitCandidate.)
 - #69125 (Add comment to SGX entry code)
 - #69126 (miri: fix exact_div)
 - #69127 (Enable use after scope detection in the new LLVM pass manager)
 - #69135 (Spelling error "represening" to "representing")
 - #69141 (Don't error on network failures)

Failed merges:

r? @ghost

src/librustc/ich/impls_hir.rs

@@ -270,7 +270,6 @@ impl<'a> ToStableHashKey<StableHashingContext<'a>> for hir::TraitCandidate {
 
         let import_keys = import_ids
             .iter()
-            .map(|node_id| hcx.node_to_hir_id(*node_id))
             .map(|hir_id| (hcx.local_def_path_hash(hir_id.owner), hir_id.local_id))
             .collect();
         (hcx.def_path_hash(*def_id), import_keys)

src/librustc/ty/context.rs

@@ -1161,6 +1161,10 @@ impl<'tcx> TyCtxt<'tcx> {
         for (k, v) in resolutions.trait_map {
             let hir_id = hir.node_to_hir_id(k);
             let map = trait_map.entry(hir_id.owner).or_default();
+            let v = v
+                .into_iter()
+                .map(|tc| tc.map_import_ids(|id| hir.definitions().node_to_hir_id(id)))
+                .collect();
             map.insert(hir_id.local_id, StableVec::new(v));
         }
 

src/librustc/ty/mod.rs

@@ -126,7 +126,7 @@ pub struct ResolverOutputs {
     pub definitions: hir_map::Definitions,
     pub cstore: Box<CrateStoreDyn>,
     pub extern_crate_map: NodeMap<CrateNum>,
-    pub trait_map: TraitMap,
+    pub trait_map: TraitMap<NodeId>,
     pub maybe_unused_trait_imports: NodeSet,
     pub maybe_unused_extern_crates: Vec<(NodeId, Span)>,
     pub export_map: ExportMap<NodeId>,

src/librustc_ast_pretty/pprust.rs

@@ -1269,6 +1269,7 @@ impl<'a> State<'a> {
                 self.print_where_clause(&generics.where_clause);
                 self.s.word(" ");
                 self.bopen();
+                self.print_inner_attributes(&item.attrs);
                 for trait_item in trait_items {
                     self.print_assoc_item(trait_item);
                 }

src/librustc_expand/expand.rs

@@ -451,28 +451,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                         _ => unreachable!(),
                     };
                     if !item.derive_allowed() {
-                        let attr = attr::find_by_name(item.attrs(), sym::derive)
-                            .expect("`derive` attribute should exist");
-                        let span = attr.span;
-                        let mut err = self.cx.struct_span_err(
-                            span,
-                            "`derive` may only be applied to structs, enums and unions",
-                        );
-                        if let ast::AttrStyle::Inner = attr.style {
-                            let trait_list = derives
-                                .iter()
-                                .map(|t| pprust::path_to_string(t))
-                                .collect::<Vec<_>>();
-                            let suggestion = format!("#[derive({})]", trait_list.join(", "));
-                            err.span_suggestion(
-                                span,
-                                "try an outer attribute",
-                                suggestion,
-                                // We don't 𝑘𝑛𝑜𝑤 that the following item is an ADT
-                                Applicability::MaybeIncorrect,
-                            );
-                        }
-                        err.emit();
+                        self.error_derive_forbidden_on_non_adt(&derives, &item);
                     }
 
                     let mut item = self.fully_configure(item);
@@ -521,6 +500,27 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
         fragment_with_placeholders
     }
 
+    fn error_derive_forbidden_on_non_adt(&self, derives: &[Path], item: &Annotatable) {
+        let attr =
+            attr::find_by_name(item.attrs(), sym::derive).expect("`derive` attribute should exist");
+        let span = attr.span;
+        let mut err = self
+            .cx
+            .struct_span_err(span, "`derive` may only be applied to structs, enums and unions");
+        if let ast::AttrStyle::Inner = attr.style {
+            let trait_list = derives.iter().map(|t| pprust::path_to_string(t)).collect::<Vec<_>>();
+            let suggestion = format!("#[derive({})]", trait_list.join(", "));
+            err.span_suggestion(
+                span,
+                "try an outer attribute",
+                suggestion,
+                // We don't 𝑘𝑛𝑜𝑤 that the following item is an ADT
+                Applicability::MaybeIncorrect,
+            );
+        }
+        err.emit();
+    }
+
     fn resolve_imports(&mut self) {
         if self.monotonic {
             self.cx.resolver.resolve_imports();
@@ -606,21 +606,38 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
         }
     }
 
-    fn expand_invoc(&mut self, invoc: Invocation, ext: &SyntaxExtensionKind) -> AstFragment {
-        if self.cx.current_expansion.depth > self.cx.ecfg.recursion_limit {
-            let expn_data = self.cx.current_expansion.id.expn_data();
-            let suggested_limit = self.cx.ecfg.recursion_limit * 2;
-            let mut err = self.cx.struct_span_err(
+    fn error_recursion_limit_reached(&mut self) {
+        let expn_data = self.cx.current_expansion.id.expn_data();
+        let suggested_limit = self.cx.ecfg.recursion_limit * 2;
+        self.cx
+            .struct_span_err(
                 expn_data.call_site,
                 &format!("recursion limit reached while expanding `{}`", expn_data.kind.descr()),
-            );
-            err.help(&format!(
+            )
+            .help(&format!(
                 "consider adding a `#![recursion_limit=\"{}\"]` attribute to your crate (`{}`)",
                 suggested_limit, self.cx.ecfg.crate_name,
-            ));
-            err.emit();
-            self.cx.trace_macros_diag();
-            FatalError.raise();
+            ))
+            .emit();
+        self.cx.trace_macros_diag();
+        FatalError.raise();
+    }
+
+    /// A macro's expansion does not fit in this fragment kind.
+    /// For example, a non-type macro in a type position.
+    fn error_wrong_fragment_kind(&mut self, kind: AstFragmentKind, mac: &ast::Mac, span: Span) {
+        let msg = format!(
+            "non-{kind} macro in {kind} position: {path}",
+            kind = kind.name(),
+            path = pprust::path_to_string(&mac.path),
+        );
+        self.cx.span_err(span, &msg);
+        self.cx.trace_macros_diag();
+    }
+
+    fn expand_invoc(&mut self, invoc: Invocation, ext: &SyntaxExtensionKind) -> AstFragment {
+        if self.cx.current_expansion.depth > self.cx.ecfg.recursion_limit {
+            self.error_recursion_limit_reached();
         }
 
         let (fragment_kind, span) = (invoc.fragment_kind, invoc.span());
@@ -638,13 +655,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                     let result = if let Some(result) = fragment_kind.make_from(tok_result) {
                         result
                     } else {
-                        let msg = format!(
-                            "non-{kind} macro in {kind} position: {path}",
-                            kind = fragment_kind.name(),
-                            path = pprust::path_to_string(&mac.path),
-                        );
-                        self.cx.span_err(span, &msg);
-                        self.cx.trace_macros_diag();
+                        self.error_wrong_fragment_kind(fragment_kind, &mac, span);
                         fragment_kind.dummy(span)
                     };
                     self.cx.current_expansion.prior_type_ascription = prev;
@@ -867,7 +878,7 @@ pub fn parse_ast_fragment<'a>(
         AstFragmentKind::ForeignItems => {
             let mut items = SmallVec::new();
             while this.token != token::Eof {
-                items.push(this.parse_foreign_item()?);
+                items.push(this.parse_foreign_item(&mut false)?);
             }
             AstFragment::ForeignItems(items)
         }
@@ -1030,13 +1041,10 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
     }
 
     /// If `item` is an attr invocation, remove and return the macro attribute and derive traits.
-    fn classify_item<T>(
+    fn classify_item(
         &mut self,
-        item: &mut T,
-    ) -> (Option<ast::Attribute>, Vec<Path>, /* after_derive */ bool)
-    where
-        T: HasAttrs,
-    {
+        item: &mut impl HasAttrs,
+    ) -> (Option<ast::Attribute>, Vec<Path>, /* after_derive */ bool) {
         let (mut attr, mut traits, mut after_derive) = (None, Vec::new(), false);
 
         item.visit_attrs(|mut attrs| {
@@ -1050,9 +1058,9 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
     /// Alternative to `classify_item()` that ignores `#[derive]` so invocations fallthrough
     /// to the unused-attributes lint (making it an error on statements and expressions
     /// is a breaking change)
-    fn classify_nonitem<T: HasAttrs>(
+    fn classify_nonitem(
         &mut self,
-        nonitem: &mut T,
+        nonitem: &mut impl HasAttrs,
     ) -> (Option<ast::Attribute>, /* after_derive */ bool) {
         let (mut attr, mut after_derive) = (None, false);
 
@@ -1375,21 +1383,14 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
                     _ => unreachable!(),
                 })
             }
-            ast::ItemKind::Mod(ast::Mod { inner, .. }) => {
-                if item.ident == Ident::invalid() {
-                    return noop_flat_map_item(item, self);
-                }
-
+            ast::ItemKind::Mod(ast::Mod { inner, inline, .. })
+                if item.ident != Ident::invalid() =>
+            {
                 let orig_directory_ownership = self.cx.current_expansion.directory_ownership;
                 let mut module = (*self.cx.current_expansion.module).clone();
                 module.mod_path.push(item.ident);
 
-                // Detect if this is an inline module (`mod m { ... }` as opposed to `mod m;`).
-                // In the non-inline case, `inner` is never the dummy span (cf. `parse_item_mod`).
-                // Thus, if `inner` is the dummy span, we know the module is inline.
-                let inline_module = item.span.contains(inner) || inner.is_dummy();
-
-                if inline_module {
+                if inline {
                     if let Some(path) = attr::first_attr_value_str_by_name(&item.attrs, sym::path) {
                         self.cx.current_expansion.directory_ownership =
                             DirectoryOwnership::Owned { relative: None };

src/librustc_hir/hir.rs

@@ -16,7 +16,7 @@ use rustc_span::source_map::{SourceMap, Spanned};
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::{MultiSpan, Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
-use syntax::ast::{self, AsmDialect, CrateSugar, Ident, Name, NodeId};
+use syntax::ast::{self, AsmDialect, CrateSugar, Ident, Name};
 use syntax::ast::{AttrVec, Attribute, FloatTy, IntTy, Label, LitKind, StrStyle, UintTy};
 pub use syntax::ast::{BorrowKind, ImplPolarity, IsAuto};
 pub use syntax::ast::{CaptureBy, Movability, Mutability};
@@ -2608,13 +2608,24 @@ pub type CaptureModeMap = NodeMap<CaptureBy>;
 // has length > 0 if the trait is found through an chain of imports, starting with the
 // import/use statement in the scope where the trait is used.
 #[derive(Clone, Debug)]
-pub struct TraitCandidate {
+pub struct TraitCandidate<ID = HirId> {
     pub def_id: DefId,
-    pub import_ids: SmallVec<[NodeId; 1]>,
+    pub import_ids: SmallVec<[ID; 1]>,
+}
+
+impl<ID> TraitCandidate<ID> {
+    pub fn map_import_ids<F, T>(self, f: F) -> TraitCandidate<T>
+    where
+        F: Fn(ID) -> T,
+    {
+        let TraitCandidate { def_id, import_ids } = self;
+        let import_ids = import_ids.into_iter().map(f).collect();
+        TraitCandidate { def_id, import_ids }
+    }
 }
 
 // Trait method resolution
-pub type TraitMap = NodeMap<Vec<TraitCandidate>>;
+pub type TraitMap<ID = HirId> = NodeMap<Vec<TraitCandidate<ID>>>;
 
 // Map from the NodeId of a glob import to a list of items which are actually
 // imported.

src/librustc_lexer/src/lib.rs

@@ -35,7 +35,7 @@ impl Token {
     }
 }
 
-/// Enum represening common lexeme types.
+/// Enum representing common lexeme types.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
 pub enum TokenKind {
     // Multi-char tokens:

src/librustc_mir/interpret/intrinsics.rs

@@ -384,8 +384,9 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     ) -> InterpResult<'tcx> {
         // Performs an exact division, resulting in undefined behavior where
         // `x % y != 0` or `y == 0` or `x == T::min_value() && y == -1`.
-        // First, check x % y != 0.
-        if self.binary_op(BinOp::Rem, a, b)?.to_bits()? != 0 {
+        // First, check x % y != 0 (or if that computation overflows).
+        let (res, overflow, _ty) = self.overflowing_binary_op(BinOp::Rem, a, b)?;
+        if overflow || res.to_bits(a.layout.size)? != 0 {
             // Then, check if `b` is -1, which is the "min_value / -1" case.
             let minus1 = Scalar::from_int(-1, dest.layout.size);
             let b_scalar = b.to_scalar().unwrap();
@@ -395,6 +396,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 throw_ub_format!("exact_div: {} cannot be divided by {} without remainder", a, b,)
             }
         }
+        // `Rem` says this is all right, so we can let `Div` do its job.
         self.binop_ignore_overflow(BinOp::Div, a, b, dest)
     }
 }