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-rw-r--r--compiler/rustc_builtin_macros/src/alloc_error_handler.rs11
-rw-r--r--compiler/rustc_builtin_macros/src/asm.rs3
-rw-r--r--compiler/rustc_builtin_macros/src/assert/context.rs1
-rw-r--r--compiler/rustc_builtin_macros/src/autodiff.rs28
-rw-r--r--compiler/rustc_builtin_macros/src/deriving/clone.rs4
-rw-r--r--compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs2
-rw-r--r--compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs6
-rw-r--r--compiler/rustc_builtin_macros/src/deriving/generic/mod.rs17
-rw-r--r--compiler/rustc_builtin_macros/src/global_allocator.rs20
-rw-r--r--compiler/rustc_builtin_macros/src/proc_macro_harness.rs41
-rw-r--r--compiler/rustc_builtin_macros/src/standard_library_imports.rs4
-rw-r--r--compiler/rustc_builtin_macros/src/test.rs24
-rw-r--r--compiler/rustc_builtin_macros/src/test_harness.rs46
13 files changed, 97 insertions, 110 deletions
diff --git a/compiler/rustc_builtin_macros/src/alloc_error_handler.rs b/compiler/rustc_builtin_macros/src/alloc_error_handler.rs
index 1c1b2c88f76..ea406e70666 100644
--- a/compiler/rustc_builtin_macros/src/alloc_error_handler.rs
+++ b/compiler/rustc_builtin_macros/src/alloc_error_handler.rs
@@ -21,15 +21,15 @@ pub(crate) fn expand(
 
     // Allow using `#[alloc_error_handler]` on an item statement
     // FIXME - if we get deref patterns, use them to reduce duplication here
-    let (item, is_stmt, sig_span) = if let Annotatable::Item(item) = &item
+    let (item, ident, is_stmt, sig_span) = if let Annotatable::Item(item) = &item
         && let ItemKind::Fn(fn_kind) = &item.kind
     {
-        (item, false, ecx.with_def_site_ctxt(fn_kind.sig.span))
+        (item, fn_kind.ident, false, ecx.with_def_site_ctxt(fn_kind.sig.span))
     } else if let Annotatable::Stmt(stmt) = &item
         && let StmtKind::Item(item) = &stmt.kind
         && let ItemKind::Fn(fn_kind) = &item.kind
     {
-        (item, true, ecx.with_def_site_ctxt(fn_kind.sig.span))
+        (item, fn_kind.ident, true, ecx.with_def_site_ctxt(fn_kind.sig.span))
     } else {
         ecx.dcx().emit_err(errors::AllocErrorMustBeFn { span: item.span() });
         return vec![orig_item];
@@ -39,7 +39,7 @@ pub(crate) fn expand(
     let span = ecx.with_def_site_ctxt(item.span);
 
     // Generate item statements for the allocator methods.
-    let stmts = thin_vec![generate_handler(ecx, item.ident, span, sig_span)];
+    let stmts = thin_vec![generate_handler(ecx, ident, span, sig_span)];
 
     // Generate anonymous constant serving as container for the allocator methods.
     let const_ty = ecx.ty(sig_span, TyKind::Tup(ThinVec::new()));
@@ -85,6 +85,7 @@ fn generate_handler(cx: &ExtCtxt<'_>, handler: Ident, span: Span, sig_span: Span
     let kind = ItemKind::Fn(Box::new(Fn {
         defaultness: ast::Defaultness::Final,
         sig,
+        ident: Ident::from_str_and_span("__rg_oom", span),
         generics: Generics::default(),
         contract: None,
         body,
@@ -93,6 +94,6 @@ fn generate_handler(cx: &ExtCtxt<'_>, handler: Ident, span: Span, sig_span: Span
 
     let attrs = thin_vec![cx.attr_word(sym::rustc_std_internal_symbol, span)];
 
-    let item = cx.item(span, Ident::from_str_and_span("__rg_oom", span), attrs, kind);
+    let item = cx.item(span, attrs, kind);
     cx.stmt_item(sig_span, item)
 }
diff --git a/compiler/rustc_builtin_macros/src/asm.rs b/compiler/rustc_builtin_macros/src/asm.rs
index eb5b345e49e..3e8ddb8abd4 100644
--- a/compiler/rustc_builtin_macros/src/asm.rs
+++ b/compiler/rustc_builtin_macros/src/asm.rs
@@ -10,7 +10,7 @@ use rustc_index::bit_set::GrowableBitSet;
 use rustc_parse::exp;
 use rustc_parse::parser::{ExpKeywordPair, Parser};
 use rustc_session::lint;
-use rustc_span::{ErrorGuaranteed, Ident, InnerSpan, Span, Symbol, kw};
+use rustc_span::{ErrorGuaranteed, InnerSpan, Span, Symbol, kw};
 use rustc_target::asm::InlineAsmArch;
 use smallvec::smallvec;
 use {rustc_ast as ast, rustc_parse_format as parse};
@@ -888,7 +888,6 @@ pub(super) fn expand_global_asm<'cx>(
             };
             match mac {
                 Ok(inline_asm) => MacEager::items(smallvec![P(ast::Item {
-                    ident: Ident::empty(),
                     attrs: ast::AttrVec::new(),
                     id: ast::DUMMY_NODE_ID,
                     kind: ast::ItemKind::GlobalAsm(Box::new(inline_asm)),
diff --git a/compiler/rustc_builtin_macros/src/assert/context.rs b/compiler/rustc_builtin_macros/src/assert/context.rs
index a949ab94f3a..ea7248ca539 100644
--- a/compiler/rustc_builtin_macros/src/assert/context.rs
+++ b/compiler/rustc_builtin_macros/src/assert/context.rs
@@ -112,7 +112,6 @@ impl<'cx, 'a> Context<'cx, 'a> {
             self.span,
             self.cx.item(
                 self.span,
-                Ident::empty(),
                 thin_vec![self.cx.attr_nested_word(sym::allow, sym::unused_imports, self.span)],
                 ItemKind::Use(UseTree {
                     prefix: self.cx.path(self.span, self.cx.std_path(&[sym::asserting])),
diff --git a/compiler/rustc_builtin_macros/src/autodiff.rs b/compiler/rustc_builtin_macros/src/autodiff.rs
index be11711757e..8937d35d53a 100644
--- a/compiler/rustc_builtin_macros/src/autodiff.rs
+++ b/compiler/rustc_builtin_macros/src/autodiff.rs
@@ -146,26 +146,26 @@ mod llvm_enzyme {
         }
         let dcx = ecx.sess.dcx();
         // first get the annotable item:
-        let (sig, is_impl): (FnSig, bool) = match &item {
+        let (primal, sig, is_impl): (Ident, FnSig, bool) = match &item {
             Annotatable::Item(iitem) => {
-                let sig = match &iitem.kind {
-                    ItemKind::Fn(box ast::Fn { sig, .. }) => sig,
+                let (ident, sig) = match &iitem.kind {
+                    ItemKind::Fn(box ast::Fn { ident, sig, .. }) => (ident, sig),
                     _ => {
                         dcx.emit_err(errors::AutoDiffInvalidApplication { span: item.span() });
                         return vec![item];
                     }
                 };
-                (sig.clone(), false)
+                (*ident, sig.clone(), false)
             }
             Annotatable::AssocItem(assoc_item, Impl { of_trait: false }) => {
-                let sig = match &assoc_item.kind {
-                    ast::AssocItemKind::Fn(box ast::Fn { sig, .. }) => sig,
+                let (ident, sig) = match &assoc_item.kind {
+                    ast::AssocItemKind::Fn(box ast::Fn { ident, sig, .. }) => (ident, sig),
                     _ => {
                         dcx.emit_err(errors::AutoDiffInvalidApplication { span: item.span() });
                         return vec![item];
                     }
                 };
-                (sig.clone(), true)
+                (*ident, sig.clone(), true)
             }
             _ => {
                 dcx.emit_err(errors::AutoDiffInvalidApplication { span: item.span() });
@@ -184,11 +184,9 @@ mod llvm_enzyme {
         let has_ret = has_ret(&sig.decl.output);
         let sig_span = ecx.with_call_site_ctxt(sig.span);
 
-        let (vis, primal) = match &item {
-            Annotatable::Item(iitem) => (iitem.vis.clone(), iitem.ident.clone()),
-            Annotatable::AssocItem(assoc_item, _) => {
-                (assoc_item.vis.clone(), assoc_item.ident.clone())
-            }
+        let vis = match &item {
+            Annotatable::Item(iitem) => iitem.vis.clone(),
+            Annotatable::AssocItem(assoc_item, _) => assoc_item.vis.clone(),
             _ => {
                 dcx.emit_err(errors::AutoDiffInvalidApplication { span: item.span() });
                 return vec![item];
@@ -237,12 +235,12 @@ mod llvm_enzyme {
         let d_body = gen_enzyme_body(
             ecx, &x, n_active, &sig, &d_sig, primal, &new_args, span, sig_span, idents, errored,
         );
-        let d_ident = first_ident(&meta_item_vec[0]);
 
         // The first element of it is the name of the function to be generated
         let asdf = Box::new(ast::Fn {
             defaultness: ast::Defaultness::Final,
             sig: d_sig,
+            ident: first_ident(&meta_item_vec[0]),
             generics: Generics::default(),
             contract: None,
             body: Some(d_body),
@@ -323,14 +321,12 @@ mod llvm_enzyme {
                 id: ast::DUMMY_NODE_ID,
                 span,
                 vis,
-                ident: d_ident,
                 kind: assoc_item,
                 tokens: None,
             });
             Annotatable::AssocItem(d_fn, Impl { of_trait: false })
         } else {
-            let mut d_fn =
-                ecx.item(span, d_ident, thin_vec![d_attr, inline_never], ItemKind::Fn(asdf));
+            let mut d_fn = ecx.item(span, thin_vec![d_attr, inline_never], ItemKind::Fn(asdf));
             d_fn.vis = vis;
             Annotatable::Item(d_fn)
         };
diff --git a/compiler/rustc_builtin_macros/src/deriving/clone.rs b/compiler/rustc_builtin_macros/src/deriving/clone.rs
index c3656e8244f..44cf215c662 100644
--- a/compiler/rustc_builtin_macros/src/deriving/clone.rs
+++ b/compiler/rustc_builtin_macros/src/deriving/clone.rs
@@ -34,8 +34,8 @@ pub(crate) fn expand_deriving_clone(
     let is_simple;
     match item {
         Annotatable::Item(annitem) => match &annitem.kind {
-            ItemKind::Struct(_, Generics { params, .. })
-            | ItemKind::Enum(_, Generics { params, .. }) => {
+            ItemKind::Struct(_, _, Generics { params, .. })
+            | ItemKind::Enum(_, _, Generics { params, .. }) => {
                 let container_id = cx.current_expansion.id.expn_data().parent.expect_local();
                 let has_derive_copy = cx.resolver.has_derive_copy(container_id);
                 if has_derive_copy
diff --git a/compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs b/compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs
index 7958e037555..aa01da3151e 100644
--- a/compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs
+++ b/compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs
@@ -21,7 +21,7 @@ pub(crate) fn expand_deriving_partial_ord(
 
     // Order in which to perform matching
     let discr_then_data = if let Annotatable::Item(item) = item
-        && let ItemKind::Enum(def, _) = &item.kind
+        && let ItemKind::Enum(_, def, _) = &item.kind
     {
         let dataful: Vec<bool> = def.variants.iter().map(|v| !v.data.fields().is_empty()).collect();
         match dataful.iter().filter(|&&b| b).count() {
diff --git a/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs b/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs
index 46b79e09780..446d8afeedd 100644
--- a/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs
+++ b/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs
@@ -30,7 +30,7 @@ pub(crate) fn expand_deriving_coerce_pointee(
     item.visit_with(&mut DetectNonGenericPointeeAttr { cx });
 
     let (name_ident, generics) = if let Annotatable::Item(aitem) = item
-        && let ItemKind::Struct(struct_data, g) = &aitem.kind
+        && let ItemKind::Struct(ident, struct_data, g) = &aitem.kind
     {
         if !matches!(
             struct_data,
@@ -40,7 +40,7 @@ pub(crate) fn expand_deriving_coerce_pointee(
             cx.dcx().emit_err(RequireOneField { span });
             return;
         }
-        (aitem.ident, g)
+        (*ident, g)
     } else {
         cx.dcx().emit_err(RequireTransparent { span });
         return;
@@ -108,7 +108,6 @@ pub(crate) fn expand_deriving_coerce_pointee(
         push(Annotatable::Item(
             cx.item(
                 span,
-                Ident::empty(),
                 attrs.clone(),
                 ast::ItemKind::Impl(Box::new(ast::Impl {
                     safety: ast::Safety::Default,
@@ -153,7 +152,6 @@ pub(crate) fn expand_deriving_coerce_pointee(
         let trait_ref = cx.trait_ref(trait_path);
         let item = cx.item(
             span,
-            Ident::empty(),
             attrs.clone(),
             ast::ItemKind::Impl(Box::new(ast::Impl {
                 safety: ast::Safety::Default,
diff --git a/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs b/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
index 03ee59de70e..b9197be4442 100644
--- a/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
+++ b/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
@@ -487,28 +487,28 @@ impl<'a> TraitDef<'a> {
                 );
 
                 let newitem = match &item.kind {
-                    ast::ItemKind::Struct(struct_def, generics) => self.expand_struct_def(
+                    ast::ItemKind::Struct(ident, struct_def, generics) => self.expand_struct_def(
                         cx,
                         struct_def,
-                        item.ident,
+                        *ident,
                         generics,
                         from_scratch,
                         is_packed,
                     ),
-                    ast::ItemKind::Enum(enum_def, generics) => {
+                    ast::ItemKind::Enum(ident, enum_def, generics) => {
                         // We ignore `is_packed` here, because `repr(packed)`
                         // enums cause an error later on.
                         //
                         // This can only cause further compilation errors
                         // downstream in blatantly illegal code, so it is fine.
-                        self.expand_enum_def(cx, enum_def, item.ident, generics, from_scratch)
+                        self.expand_enum_def(cx, enum_def, *ident, generics, from_scratch)
                     }
-                    ast::ItemKind::Union(struct_def, generics) => {
+                    ast::ItemKind::Union(ident, struct_def, generics) => {
                         if self.supports_unions {
                             self.expand_struct_def(
                                 cx,
                                 struct_def,
-                                item.ident,
+                                *ident,
                                 generics,
                                 from_scratch,
                                 is_packed,
@@ -596,7 +596,6 @@ impl<'a> TraitDef<'a> {
             P(ast::AssocItem {
                 id: ast::DUMMY_NODE_ID,
                 span: self.span,
-                ident,
                 vis: ast::Visibility {
                     span: self.span.shrink_to_lo(),
                     kind: ast::VisibilityKind::Inherited,
@@ -605,6 +604,7 @@ impl<'a> TraitDef<'a> {
                 attrs: ast::AttrVec::new(),
                 kind: ast::AssocItemKind::Type(Box::new(ast::TyAlias {
                     defaultness: ast::Defaultness::Final,
+                    ident,
                     generics: Generics::default(),
                     where_clauses: ast::TyAliasWhereClauses::default(),
                     bounds: Vec::new(),
@@ -789,7 +789,6 @@ impl<'a> TraitDef<'a> {
 
         cx.item(
             self.span,
-            Ident::empty(),
             attrs,
             ast::ItemKind::Impl(Box::new(ast::Impl {
                 safety: ast::Safety::Default,
@@ -1033,10 +1032,10 @@ impl<'a> MethodDef<'a> {
                 kind: ast::VisibilityKind::Inherited,
                 tokens: None,
             },
-            ident: method_ident,
             kind: ast::AssocItemKind::Fn(Box::new(ast::Fn {
                 defaultness,
                 sig,
+                ident: method_ident,
                 generics: fn_generics,
                 contract: None,
                 body: Some(body_block),
diff --git a/compiler/rustc_builtin_macros/src/global_allocator.rs b/compiler/rustc_builtin_macros/src/global_allocator.rs
index 90d79235820..4b1958bce32 100644
--- a/compiler/rustc_builtin_macros/src/global_allocator.rs
+++ b/compiler/rustc_builtin_macros/src/global_allocator.rs
@@ -25,15 +25,15 @@ pub(crate) fn expand(
 
     // Allow using `#[global_allocator]` on an item statement
     // FIXME - if we get deref patterns, use them to reduce duplication here
-    let (item, is_stmt, ty_span) = if let Annotatable::Item(item) = &item
-        && let ItemKind::Static(box ast::StaticItem { ty, .. }) = &item.kind
+    let (item, ident, is_stmt, ty_span) = if let Annotatable::Item(item) = &item
+        && let ItemKind::Static(box ast::StaticItem { ident, ty, .. }) = &item.kind
     {
-        (item, false, ecx.with_def_site_ctxt(ty.span))
+        (item, *ident, false, ecx.with_def_site_ctxt(ty.span))
     } else if let Annotatable::Stmt(stmt) = &item
         && let StmtKind::Item(item) = &stmt.kind
-        && let ItemKind::Static(box ast::StaticItem { ty, .. }) = &item.kind
+        && let ItemKind::Static(box ast::StaticItem { ident, ty, .. }) = &item.kind
     {
-        (item, true, ecx.with_def_site_ctxt(ty.span))
+        (item, *ident, true, ecx.with_def_site_ctxt(ty.span))
     } else {
         ecx.dcx().emit_err(errors::AllocMustStatics { span: item.span() });
         return vec![orig_item];
@@ -41,7 +41,7 @@ pub(crate) fn expand(
 
     // Generate a bunch of new items using the AllocFnFactory
     let span = ecx.with_def_site_ctxt(item.span);
-    let f = AllocFnFactory { span, ty_span, global: item.ident, cx: ecx };
+    let f = AllocFnFactory { span, ty_span, global: ident, cx: ecx };
 
     // Generate item statements for the allocator methods.
     let stmts = ALLOCATOR_METHODS.iter().map(|method| f.allocator_fn(method)).collect();
@@ -80,17 +80,13 @@ impl AllocFnFactory<'_, '_> {
         let kind = ItemKind::Fn(Box::new(Fn {
             defaultness: ast::Defaultness::Final,
             sig,
+            ident: Ident::from_str_and_span(&global_fn_name(method.name), self.span),
             generics: Generics::default(),
             contract: None,
             body,
             define_opaque: None,
         }));
-        let item = self.cx.item(
-            self.span,
-            Ident::from_str_and_span(&global_fn_name(method.name), self.span),
-            self.attrs(),
-            kind,
-        );
+        let item = self.cx.item(self.span, self.attrs(), kind);
         self.cx.stmt_item(self.ty_span, item)
     }
 
diff --git a/compiler/rustc_builtin_macros/src/proc_macro_harness.rs b/compiler/rustc_builtin_macros/src/proc_macro_harness.rs
index ee6475c8b8e..7c25f26895c 100644
--- a/compiler/rustc_builtin_macros/src/proc_macro_harness.rs
+++ b/compiler/rustc_builtin_macros/src/proc_macro_harness.rs
@@ -92,7 +92,12 @@ impl<'a> CollectProcMacros<'a> {
         }
     }
 
-    fn collect_custom_derive(&mut self, item: &'a ast::Item, attr: &'a ast::Attribute) {
+    fn collect_custom_derive(
+        &mut self,
+        item: &'a ast::Item,
+        function_name: Ident,
+        attr: &'a ast::Attribute,
+    ) {
         let Some((trait_name, proc_attrs)) =
             parse_macro_name_and_helper_attrs(self.dcx, attr, "derive")
         else {
@@ -104,7 +109,7 @@ impl<'a> CollectProcMacros<'a> {
                 id: item.id,
                 span: item.span,
                 trait_name,
-                function_name: item.ident,
+                function_name,
                 attrs: proc_attrs,
             }));
         } else {
@@ -118,12 +123,12 @@ impl<'a> CollectProcMacros<'a> {
         }
     }
 
-    fn collect_attr_proc_macro(&mut self, item: &'a ast::Item) {
+    fn collect_attr_proc_macro(&mut self, item: &'a ast::Item, function_name: Ident) {
         if self.in_root && item.vis.kind.is_pub() {
             self.macros.push(ProcMacro::Attr(ProcMacroDef {
                 id: item.id,
                 span: item.span,
-                function_name: item.ident,
+                function_name,
             }));
         } else {
             let msg = if !self.in_root {
@@ -136,12 +141,12 @@ impl<'a> CollectProcMacros<'a> {
         }
     }
 
-    fn collect_bang_proc_macro(&mut self, item: &'a ast::Item) {
+    fn collect_bang_proc_macro(&mut self, item: &'a ast::Item, function_name: Ident) {
         if self.in_root && item.vis.kind.is_pub() {
             self.macros.push(ProcMacro::Bang(ProcMacroDef {
                 id: item.id,
                 span: item.span,
-                function_name: item.ident,
+                function_name,
             }));
         } else {
             let msg = if !self.in_root {
@@ -165,12 +170,6 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
             }
         }
 
-        // First up, make sure we're checking a bare function. If we're not then
-        // we're just not interested in this item.
-        //
-        // If we find one, try to locate a `#[proc_macro_derive]` attribute on it.
-        let is_fn = matches!(item.kind, ast::ItemKind::Fn(..));
-
         let mut found_attr: Option<&'a ast::Attribute> = None;
 
         for attr in &item.attrs {
@@ -214,7 +213,13 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
             return;
         };
 
-        if !is_fn {
+        // First up, make sure we're checking a bare function. If we're not then
+        // we're just not interested in this item.
+        //
+        // If we find one, try to locate a `#[proc_macro_derive]` attribute on it.
+        let fn_ident = if let ast::ItemKind::Fn(fn_) = &item.kind {
+            fn_.ident
+        } else {
             self.dcx
                 .create_err(errors::AttributeOnlyBeUsedOnBareFunctions {
                     span: attr.span,
@@ -222,7 +227,7 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
                 })
                 .emit();
             return;
-        }
+        };
 
         if self.is_test_crate {
             return;
@@ -239,11 +244,11 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
         }
 
         if attr.has_name(sym::proc_macro_derive) {
-            self.collect_custom_derive(item, attr);
+            self.collect_custom_derive(item, fn_ident, attr);
         } else if attr.has_name(sym::proc_macro_attribute) {
-            self.collect_attr_proc_macro(item);
+            self.collect_attr_proc_macro(item, fn_ident);
         } else if attr.has_name(sym::proc_macro) {
-            self.collect_bang_proc_macro(item);
+            self.collect_bang_proc_macro(item, fn_ident);
         };
 
         let prev_in_root = mem::replace(&mut self.in_root, false);
@@ -278,7 +283,7 @@ fn mk_decls(cx: &mut ExtCtxt<'_>, macros: &[ProcMacro]) -> P<ast::Item> {
     let span = DUMMY_SP.with_def_site_ctxt(expn_id.to_expn_id());
 
     let proc_macro = Ident::new(sym::proc_macro, span);
-    let krate = cx.item(span, proc_macro, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None));
+    let krate = cx.item(span, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None, proc_macro));
 
     let bridge = Ident::new(sym::bridge, span);
     let client = Ident::new(sym::client, span);
diff --git a/compiler/rustc_builtin_macros/src/standard_library_imports.rs b/compiler/rustc_builtin_macros/src/standard_library_imports.rs
index ba63b185e09..a1ee53b7ca2 100644
--- a/compiler/rustc_builtin_macros/src/standard_library_imports.rs
+++ b/compiler/rustc_builtin_macros/src/standard_library_imports.rs
@@ -43,9 +43,8 @@ pub fn inject(
 
     let item = cx.item(
         span,
-        Ident::new(name, ident_span),
         thin_vec![cx.attr_word(sym::macro_use, span)],
-        ast::ItemKind::ExternCrate(None),
+        ast::ItemKind::ExternCrate(None, Ident::new(name, ident_span)),
     );
 
     krate.items.insert(0, item);
@@ -68,7 +67,6 @@ pub fn inject(
     // Inject the relevant crate's prelude.
     let use_item = cx.item(
         span,
-        Ident::empty(),
         thin_vec![cx.attr_word(sym::prelude_import, span)],
         ast::ItemKind::Use(ast::UseTree {
             prefix: cx.path(span, import_path),
diff --git a/compiler/rustc_builtin_macros/src/test.rs b/compiler/rustc_builtin_macros/src/test.rs
index db3e431495b..1cef4f9514c 100644
--- a/compiler/rustc_builtin_macros/src/test.rs
+++ b/compiler/rustc_builtin_macros/src/test.rs
@@ -55,12 +55,14 @@ pub(crate) fn expand_test_case(
     // `#[test_case]` is valid on functions, consts, and statics. Only modify
     // the item in those cases.
     match &mut item.kind {
-        ast::ItemKind::Fn(_) | ast::ItemKind::Const(_) | ast::ItemKind::Static(_) => {
-            item.ident.span = item.ident.span.with_ctxt(sp.ctxt());
+        ast::ItemKind::Fn(box ast::Fn { ident, .. })
+        | ast::ItemKind::Const(box ast::ConstItem { ident, .. })
+        | ast::ItemKind::Static(box ast::StaticItem { ident, .. }) => {
+            ident.span = ident.span.with_ctxt(sp.ctxt());
             let test_path_symbol = Symbol::intern(&item_path(
                 // skip the name of the root module
                 &ecx.current_expansion.module.mod_path[1..],
-                &item.ident,
+                ident,
             ));
             item.vis = ast::Visibility {
                 span: item.vis.span,
@@ -228,7 +230,7 @@ pub(crate) fn expand_test_or_bench(
                             // super::$test_fn(b)
                             cx.expr_call(
                                 ret_ty_sp,
-                                cx.expr_path(cx.path(sp, vec![item.ident])),
+                                cx.expr_path(cx.path(sp, vec![fn_.ident])),
                                 thin_vec![cx.expr_ident(sp, b)],
                             ),
                         ],
@@ -254,7 +256,7 @@ pub(crate) fn expand_test_or_bench(
                             // $test_fn()
                             cx.expr_call(
                                 ret_ty_sp,
-                                cx.expr_path(cx.path(sp, vec![item.ident])),
+                                cx.expr_path(cx.path(sp, vec![fn_.ident])),
                                 ThinVec::new(),
                             ), // )
                         ],
@@ -267,15 +269,14 @@ pub(crate) fn expand_test_or_bench(
     let test_path_symbol = Symbol::intern(&item_path(
         // skip the name of the root module
         &cx.current_expansion.module.mod_path[1..],
-        &item.ident,
+        &fn_.ident,
     ));
 
-    let location_info = get_location_info(cx, &item);
+    let location_info = get_location_info(cx, &fn_);
 
     let mut test_const =
         cx.item(
             sp,
-            Ident::new(item.ident.name, sp),
             thin_vec![
                 // #[cfg(test)]
                 cx.attr_nested_word(sym::cfg, sym::test, attr_sp),
@@ -288,6 +289,7 @@ pub(crate) fn expand_test_or_bench(
             ast::ItemKind::Const(
                 ast::ConstItem {
                     defaultness: ast::Defaultness::Final,
+                    ident: Ident::new(fn_.ident.name, sp),
                     generics: ast::Generics::default(),
                     ty: cx.ty(sp, ast::TyKind::Path(None, test_path("TestDescAndFn"))),
                     define_opaque: None,
@@ -386,7 +388,7 @@ pub(crate) fn expand_test_or_bench(
 
     // extern crate test
     let test_extern =
-        cx.item(sp, test_ident, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None));
+        cx.item(sp, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None, test_ident));
 
     debug!("synthetic test item:\n{}\n", pprust::item_to_string(&test_const));
 
@@ -440,8 +442,8 @@ fn not_testable_error(cx: &ExtCtxt<'_>, attr_sp: Span, item: Option<&ast::Item>)
         .emit();
 }
 
-fn get_location_info(cx: &ExtCtxt<'_>, item: &ast::Item) -> (Symbol, usize, usize, usize, usize) {
-    let span = item.ident.span;
+fn get_location_info(cx: &ExtCtxt<'_>, fn_: &ast::Fn) -> (Symbol, usize, usize, usize, usize) {
+    let span = fn_.ident.span;
     let (source_file, lo_line, lo_col, hi_line, hi_col) =
         cx.sess.source_map().span_to_location_info(span);
 
diff --git a/compiler/rustc_builtin_macros/src/test_harness.rs b/compiler/rustc_builtin_macros/src/test_harness.rs
index 768b459ec5e..56a67b0534d 100644
--- a/compiler/rustc_builtin_macros/src/test_harness.rs
+++ b/compiler/rustc_builtin_macros/src/test_harness.rs
@@ -134,7 +134,8 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
         if let Some(name) = get_test_name(&item) {
             debug!("this is a test item");
 
-            let test = Test { span: item.span, ident: item.ident, name };
+            // `unwrap` is ok because only functions, consts, and static should reach here.
+            let test = Test { span: item.span, ident: item.kind.ident().unwrap(), name };
             self.tests.push(test);
         }
 
@@ -142,19 +143,12 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
         // mods or tests inside of functions will break things
         if let ast::ItemKind::Mod(
             _,
+            _,
             ModKind::Loaded(.., ast::ModSpans { inner_span: span, .. }, _),
         ) = item.kind
         {
             let prev_tests = mem::take(&mut self.tests);
-            walk_item_kind(
-                &mut item.kind,
-                item.span,
-                item.id,
-                &mut item.ident,
-                &mut item.vis,
-                (),
-                self,
-            );
+            walk_item_kind(&mut item.kind, item.span, item.id, &mut item.vis, (), self);
             self.add_test_cases(item.id, span, prev_tests);
         } else {
             // But in those cases, we emit a lint to warn the user of these missing tests.
@@ -181,9 +175,9 @@ impl<'a> Visitor<'a> for InnerItemLinter<'_> {
 }
 
 fn entry_point_type(item: &ast::Item, at_root: bool) -> EntryPointType {
-    match item.kind {
-        ast::ItemKind::Fn(..) => {
-            rustc_ast::entry::entry_point_type(&item.attrs, at_root, Some(item.ident.name))
+    match &item.kind {
+        ast::ItemKind::Fn(fn_) => {
+            rustc_ast::entry::entry_point_type(&item.attrs, at_root, Some(fn_.ident.name))
         }
         _ => EntryPointType::None,
     }
@@ -295,7 +289,7 @@ fn generate_test_harness(
 fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
     let sp = cx.def_site;
     let ecx = &cx.ext_cx;
-    let test_id = Ident::new(sym::test, sp);
+    let test_ident = Ident::new(sym::test, sp);
 
     let runner_name = match cx.panic_strategy {
         PanicStrategy::Unwind => "test_main_static",
@@ -303,10 +297,9 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
     };
 
     // test::test_main_static(...)
-    let mut test_runner = cx
-        .test_runner
-        .clone()
-        .unwrap_or_else(|| ecx.path(sp, vec![test_id, Ident::from_str_and_span(runner_name, sp)]));
+    let mut test_runner = cx.test_runner.clone().unwrap_or_else(|| {
+        ecx.path(sp, vec![test_ident, Ident::from_str_and_span(runner_name, sp)])
+    });
 
     test_runner.span = sp;
 
@@ -317,7 +310,7 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
     // extern crate test
     let test_extern_stmt = ecx.stmt_item(
         sp,
-        ecx.item(sp, test_id, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None)),
+        ecx.item(sp, ast::AttrVec::new(), ast::ItemKind::ExternCrate(None, test_ident)),
     );
 
     // #[rustc_main]
@@ -340,23 +333,24 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
     let decl = ecx.fn_decl(ThinVec::new(), ast::FnRetTy::Ty(main_ret_ty));
     let sig = ast::FnSig { decl, header: ast::FnHeader::default(), span: sp };
     let defaultness = ast::Defaultness::Final;
+
+    // Honor the reexport_test_harness_main attribute
+    let main_ident = match cx.reexport_test_harness_main {
+        Some(sym) => Ident::new(sym, sp.with_ctxt(SyntaxContext::root())),
+        None => Ident::new(sym::main, sp),
+    };
+
     let main = ast::ItemKind::Fn(Box::new(ast::Fn {
         defaultness,
         sig,
+        ident: main_ident,
         generics: ast::Generics::default(),
         contract: None,
         body: Some(main_body),
         define_opaque: None,
     }));
 
-    // Honor the reexport_test_harness_main attribute
-    let main_id = match cx.reexport_test_harness_main {
-        Some(sym) => Ident::new(sym, sp.with_ctxt(SyntaxContext::root())),
-        None => Ident::new(sym::main, sp),
-    };
-
     let main = P(ast::Item {
-        ident: main_id,
         attrs: thin_vec![main_attr, coverage_attr, doc_hidden_attr],
         id: ast::DUMMY_NODE_ID,
         kind: main,