Rollup of 7 pull requests

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -812,12 +812,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             return FnSelfUse {
                 var_span: stmt.source_info.span,
                 fn_call_span: *fn_span,
-                fn_span: self
-                    .infcx
-                    .tcx
-                    .sess
-                    .source_map()
-                    .guess_head_span(self.infcx.tcx.def_span(method_did)),
+                fn_span: self.infcx.tcx.def_span(method_did),
                 kind,
             };
         }

compiler/rustc_codegen_ssa/src/mir/intrinsic.rs

@@ -513,9 +513,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                         };
 
                         let ty = substs.type_at(0);
-                        if int_type_width_signed(ty, bx.tcx()).is_some()
-                            || (ty.is_unsafe_ptr() && op == "xchg")
-                        {
+                        if int_type_width_signed(ty, bx.tcx()).is_some() || ty.is_unsafe_ptr() {
                             let mut ptr = args[0].immediate();
                             let mut val = args[1].immediate();
                             if ty.is_unsafe_ptr() {

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -155,8 +155,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                     });
 
                     if let Ok(Some(ImplSource::UserDefined(data))) = implsrc {
-                        let span =
-                            tcx.sess.source_map().guess_head_span(tcx.def_span(data.impl_def_id));
+                        let span = tcx.def_span(data.impl_def_id);
                         err.span_note(span, "impl defined here, but it is not `const`");
                     }
                 }
@@ -205,7 +204,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
 
                 match self_ty.kind() {
                     FnDef(def_id, ..) => {
-                        let span = tcx.sess.source_map().guess_head_span(tcx.def_span(*def_id));
+                        let span = tcx.def_span(*def_id);
                         if ccx.tcx.is_const_fn_raw(*def_id) {
                             span_bug!(span, "calling const FnDef errored when it shouldn't");
                         }

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -148,12 +148,10 @@ fn msg_span_from_early_bound_and_free_regions<'tcx>(
     tcx: TyCtxt<'tcx>,
     region: ty::Region<'tcx>,
 ) -> (String, Span) {
-    let sm = tcx.sess.source_map();
-
     let scope = region.free_region_binding_scope(tcx).expect_local();
     match *region {
         ty::ReEarlyBound(ref br) => {
-            let mut sp = sm.guess_head_span(tcx.def_span(scope));
+            let mut sp = tcx.def_span(scope);
             if let Some(param) =
                 tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(br.name))
             {
@@ -174,7 +172,7 @@ fn msg_span_from_early_bound_and_free_regions<'tcx>(
             } else {
                 match fr.bound_region {
                     ty::BoundRegionKind::BrNamed(_, name) => {
-                        let mut sp = sm.guess_head_span(tcx.def_span(scope));
+                        let mut sp = tcx.def_span(scope);
                         if let Some(param) =
                             tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(name))
                         {
@@ -193,7 +191,7 @@ fn msg_span_from_early_bound_and_free_regions<'tcx>(
                     ),
                     _ => (
                         format!("the lifetime `{}` as defined here", region),
-                        sm.guess_head_span(tcx.def_span(scope)),
+                        tcx.def_span(scope),
                     ),
                 }
             }

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

@@ -23,10 +23,12 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
 
         let mut err = struct_span_err!(self.tcx.sess, sp, E0276, "{}", msg);
 
-        if let Some(trait_item_span) = self.tcx.hir().span_if_local(trait_item_def_id) {
-            let span = self.tcx.sess.source_map().guess_head_span(trait_item_span);
+        if trait_item_def_id.is_local() {
             let item_name = self.tcx.item_name(impl_item_def_id.to_def_id());
-            err.span_label(span, format!("definition of `{}` from trait", item_name));
+            err.span_label(
+                self.tcx.def_span(trait_item_def_id),
+                format!("definition of `{}` from trait", item_name),
+            );
         }
 
         err.span_label(sp, format!("impl has extra requirement {}", requirement));

compiler/rustc_lint/src/builtin.rs

@@ -552,7 +552,6 @@ impl MissingDoc {
         &self,
         cx: &LateContext<'_>,
         def_id: LocalDefId,
-        sp: Span,
         article: &'static str,
         desc: &'static str,
     ) {
@@ -579,16 +578,12 @@ impl MissingDoc {
         let attrs = cx.tcx.hir().attrs(cx.tcx.hir().local_def_id_to_hir_id(def_id));
         let has_doc = attrs.iter().any(has_doc);
         if !has_doc {
-            cx.struct_span_lint(
-                MISSING_DOCS,
-                cx.tcx.sess.source_map().guess_head_span(sp),
-                |lint| {
-                    lint.build(fluent::lint::builtin_missing_doc)
-                        .set_arg("article", article)
-                        .set_arg("desc", desc)
-                        .emit();
-                },
-            );
+            cx.struct_span_lint(MISSING_DOCS, cx.tcx.def_span(def_id), |lint| {
+                lint.build(fluent::lint::builtin_missing_doc)
+                    .set_arg("article", article)
+                    .set_arg("desc", desc)
+                    .emit();
+            });
         }
     }
 }
@@ -611,13 +606,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
     }
 
     fn check_crate(&mut self, cx: &LateContext<'_>) {
-        self.check_missing_docs_attrs(
-            cx,
-            CRATE_DEF_ID,
-            cx.tcx.def_span(CRATE_DEF_ID),
-            "the",
-            "crate",
-        );
+        self.check_missing_docs_attrs(cx, CRATE_DEF_ID, "the", "crate");
     }
 
     fn check_item(&mut self, cx: &LateContext<'_>, it: &hir::Item<'_>) {
@@ -647,13 +636,13 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
 
         let (article, desc) = cx.tcx.article_and_description(it.def_id.to_def_id());
 
-        self.check_missing_docs_attrs(cx, it.def_id, it.span, article, desc);
+        self.check_missing_docs_attrs(cx, it.def_id, article, desc);
     }
 
     fn check_trait_item(&mut self, cx: &LateContext<'_>, trait_item: &hir::TraitItem<'_>) {
         let (article, desc) = cx.tcx.article_and_description(trait_item.def_id.to_def_id());
 
-        self.check_missing_docs_attrs(cx, trait_item.def_id, trait_item.span, article, desc);
+        self.check_missing_docs_attrs(cx, trait_item.def_id, article, desc);
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {
@@ -681,23 +670,23 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
         }
 
         let (article, desc) = cx.tcx.article_and_description(impl_item.def_id.to_def_id());
-        self.check_missing_docs_attrs(cx, impl_item.def_id, impl_item.span, article, desc);
+        self.check_missing_docs_attrs(cx, impl_item.def_id, article, desc);
     }
 
     fn check_foreign_item(&mut self, cx: &LateContext<'_>, foreign_item: &hir::ForeignItem<'_>) {
         let (article, desc) = cx.tcx.article_and_description(foreign_item.def_id.to_def_id());
-        self.check_missing_docs_attrs(cx, foreign_item.def_id, foreign_item.span, article, desc);
+        self.check_missing_docs_attrs(cx, foreign_item.def_id, article, desc);
     }
 
     fn check_field_def(&mut self, cx: &LateContext<'_>, sf: &hir::FieldDef<'_>) {
         if !sf.is_positional() {
             let def_id = cx.tcx.hir().local_def_id(sf.hir_id);
-            self.check_missing_docs_attrs(cx, def_id, sf.span, "a", "struct field")
+            self.check_missing_docs_attrs(cx, def_id, "a", "struct field")
         }
     }
 
     fn check_variant(&mut self, cx: &LateContext<'_>, v: &hir::Variant<'_>) {
-        self.check_missing_docs_attrs(cx, cx.tcx.hir().local_def_id(v.id), v.span, "a", "variant");
+        self.check_missing_docs_attrs(cx, cx.tcx.hir().local_def_id(v.id), "a", "variant");
     }
 }
 

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

@@ -1013,12 +1013,13 @@ impl<'hir> Map<'hir> {
                 ItemKind::Use(path, _) => path.span,
                 _ => named_span(item.span, item.ident, item.kind.generics()),
             },
+            Node::Variant(variant) => named_span(variant.span, variant.ident, None),
             Node::ImplItem(item) => named_span(item.span, item.ident, Some(item.generics)),
             Node::ForeignItem(item) => match item.kind {
                 ForeignItemKind::Fn(decl, _, _) => until_within(item.span, decl.output.span()),
                 _ => named_span(item.span, item.ident, None),
             },
-            Node::Ctor(..) => return self.opt_span(self.get_parent_node(hir_id)),
+            Node::Ctor(_) => return self.opt_span(self.get_parent_node(hir_id)),
             _ => self.span_with_body(hir_id),
         };
         Some(span)

compiler/rustc_middle/src/mir/syntax.rs

@@ -396,6 +396,8 @@ pub struct CopyNonOverlapping<'tcx> {
 ///////////////////////////////////////////////////////////////////////////
 // Terminators
 
+/// The various kinds of terminators, representing ways of exiting from a basic block.
+///
 /// A note on unwinding: Panics may occur during the execution of some terminators. Depending on the
 /// `-C panic` flag, this may either cause the program to abort or the call stack to unwind. Such
 /// terminators have a `cleanup: Option<BasicBlock>` field on them. If stack unwinding occurs, then
@@ -911,7 +913,7 @@ pub enum Operand<'tcx> {
 static_assert_size!(Operand<'_>, 24);
 
 ///////////////////////////////////////////////////////////////////////////
-/// Rvalues
+// Rvalues
 
 /// The various kinds of rvalues that can appear in MIR.
 ///

compiler/rustc_middle/src/ty/error.rs

@@ -795,7 +795,7 @@ fn foo(&self) -> Self::T { String::new() }
                         if item_def_id == proj_ty_item_def_id =>
                     {
                         Some((
-                            self.sess.source_map().guess_head_span(self.def_span(item.def_id)),
+                            self.def_span(item.def_id),
                             format!("consider calling `{}`", self.def_path_str(item.def_id)),
                         ))
                     }

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

@@ -1112,18 +1112,12 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                     })
                     .collect::<Option<Vec<ArgKind>>>()?,
             ),
-            Node::Item(&hir::Item { span, kind: hir::ItemKind::Fn(ref sig, ..), .. })
-            | Node::ImplItem(&hir::ImplItem {
-                span,
-                kind: hir::ImplItemKind::Fn(ref sig, _),
-                ..
-            })
+            Node::Item(&hir::Item { kind: hir::ItemKind::Fn(ref sig, ..), .. })
+            | Node::ImplItem(&hir::ImplItem { kind: hir::ImplItemKind::Fn(ref sig, _), .. })
             | Node::TraitItem(&hir::TraitItem {
-                span,
-                kind: hir::TraitItemKind::Fn(ref sig, _),
-                ..
+                kind: hir::TraitItemKind::Fn(ref sig, _), ..
             }) => (
-                sm.guess_head_span(span),
+                sig.span,
                 sig.decl
                     .inputs
                     .iter()
@@ -1138,7 +1132,6 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
             ),
             Node::Ctor(ref variant_data) => {
                 let span = variant_data.ctor_hir_id().map_or(DUMMY_SP, |id| hir.span(id));
-                let span = sm.guess_head_span(span);
                 (span, vec![ArgKind::empty(); variant_data.fields().len()])
             }
             _ => panic!("non-FnLike node found: {:?}", node),
@@ -2185,7 +2178,7 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
         let mut post = vec![];
         for def_id in impls {
             match self.tcx.span_of_impl(*def_id) {
-                Ok(span) => spans.push(self.tcx.sess.source_map().guess_head_span(span)),
+                Ok(span) => spans.push(span),
                 Err(name) => {
                     crates.push(name);
                     if let Some(header) = to_pretty_impl_header(self.tcx, *def_id) {
@@ -2532,8 +2525,7 @@ pub fn recursive_type_with_infinite_size_error<'tcx>(
     spans: Vec<(Span, Option<hir::HirId>)>,
 ) {
     assert!(type_def_id.is_local());
-    let span = tcx.hir().span_if_local(type_def_id).unwrap();
-    let span = tcx.sess.source_map().guess_head_span(span);
+    let span = tcx.def_span(type_def_id);
     let path = tcx.def_path_str(type_def_id);
     let mut err =
         struct_span_err!(tcx.sess, span, E0072, "recursive type `{}` has infinite size", path);

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

@@ -340,10 +340,7 @@ fn report_negative_positive_conflict(
     positive_impl_def_id: DefId,
     sg: &mut specialization_graph::Graph,
 ) {
-    let impl_span = tcx
-        .sess
-        .source_map()
-        .guess_head_span(tcx.span_of_impl(local_impl_def_id.to_def_id()).unwrap());
+    let impl_span = tcx.def_span(local_impl_def_id);
 
     let mut err = struct_span_err!(
         tcx.sess,
@@ -356,10 +353,7 @@ fn report_negative_positive_conflict(
 
     match tcx.span_of_impl(negative_impl_def_id) {
         Ok(span) => {
-            err.span_label(
-                tcx.sess.source_map().guess_head_span(span),
-                "negative implementation here".to_string(),
-            );
+            err.span_label(span, "negative implementation here");
         }
         Err(cname) => {
             err.note(&format!("negative implementation in crate `{}`", cname));
@@ -368,10 +362,7 @@ fn report_negative_positive_conflict(
 
     match tcx.span_of_impl(positive_impl_def_id) {
         Ok(span) => {
-            err.span_label(
-                tcx.sess.source_map().guess_head_span(span),
-                "positive implementation here".to_string(),
-            );
+            err.span_label(span, "positive implementation here");
         }
         Err(cname) => {
             err.note(&format!("positive implementation in crate `{}`", cname));
@@ -388,8 +379,7 @@ fn report_conflicting_impls(
     used_to_be_allowed: Option<FutureCompatOverlapErrorKind>,
     sg: &mut specialization_graph::Graph,
 ) {
-    let impl_span =
-        tcx.sess.source_map().guess_head_span(tcx.span_of_impl(impl_def_id.to_def_id()).unwrap());
+    let impl_span = tcx.def_span(impl_def_id);
 
     // Work to be done after we've built the DiagnosticBuilder. We have to define it
     // now because the struct_lint methods don't return back the DiagnosticBuilder
@@ -416,10 +406,7 @@ fn report_conflicting_impls(
         let mut err = err.build(&msg);
         match tcx.span_of_impl(overlap.with_impl) {
             Ok(span) => {
-                err.span_label(
-                    tcx.sess.source_map().guess_head_span(span),
-                    "first implementation here".to_string(),
-                );
+                err.span_label(span, "first implementation here".to_string());
 
                 err.span_label(
                     impl_span,

compiler/rustc_typeck/src/astconv/mod.rs

@@ -1958,9 +1958,11 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                         );
                     }
 
-                    if let Some(sp) = tcx.hir().span_if_local(adt_def.did()) {
-                        let sp = tcx.sess.source_map().guess_head_span(sp);
-                        err.span_label(sp, format!("variant `{}` not found here", assoc_ident));
+                    if adt_def.did().is_local() {
+                        err.span_label(
+                            tcx.def_span(adt_def.did()),
+                            format!("variant `{assoc_ident}` not found for this enum"),
+                        );
                     }
 
                     err.emit()
@@ -2450,7 +2452,6 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
                     let msg = format!("`Self` is of type `{ty}`");
                     if let (Ok(i_sp), Some(t_sp)) = (span_of_impl, span_of_ty) {
-                        let i_sp = tcx.sess.source_map().guess_head_span(i_sp);
                         let mut span: MultiSpan = vec![t_sp].into();
                         span.push_span_label(
                             i_sp,