Remove redundant to_ident_string calls

compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs

@@ -157,7 +157,7 @@ pub(crate) fn expand_deriving_coerce_pointee(
         {
             cx.dcx().emit_err(RequiresMaybeSized {
                 span: pointee_ty_ident.span,
-                name: pointee_ty_ident.name.to_ident_string(),
+                name: pointee_ty_ident,
             });
             return;
         }
@@ -471,5 +471,5 @@ struct TooManyPointees {
 struct RequiresMaybeSized {
     #[primary_span]
     span: Span,
-    name: String,
+    name: Ident,
 }

compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs

@@ -495,7 +495,7 @@ impl<'a, 'tcx> WrongNumberOfGenericArgs<'a, 'tcx> {
                         .iter()
                         .any(|constraint| constraint.ident.name == item.name)
                 })
-                .map(|item| item.name.to_ident_string())
+                .map(|item| self.tcx.item_ident(item.def_id).to_string())
                 .collect()
         } else {
             Vec::default()

compiler/rustc_hir_typeck/src/expr.rs

@@ -3337,10 +3337,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 })
                 .map(|mut field_path| {
                     field_path.pop();
-                    field_path
+                    field_path.iter().map(|id| format!("{}.", id)).collect::<String>()
-                        .iter()
-                        .map(|id| format!("{}.", id.name.to_ident_string()))
-                        .collect::<String>()
                 })
                 .collect::<Vec<_>>();
             candidate_fields.sort();

compiler/rustc_hir_typeck/src/lib.rs

@@ -453,7 +453,7 @@ fn report_unexpected_variant_res(
                 );
                 let fields = fields
                     .iter()
-                    .map(|field| format!("{}: _", field.name.to_ident_string()))
+                    .map(|field| format!("{}: _", field.ident(tcx)))
                     .collect::<Vec<_>>()
                     .join(", ");
                 let sugg = format!(" {{ {} }}", fields);

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -2714,7 +2714,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     .map(|field_path| {
                         field_path
                             .iter()
-                            .map(|id| id.name.to_ident_string())
+                            .map(|id| id.to_string())
                             .collect::<Vec<String>>()
                             .join(".")
                     })

compiler/rustc_lint/src/non_local_def.rs

@@ -343,5 +343,5 @@ fn path_span_without_args(path: &Path<'_>) -> Span {
 
 /// Return a "error message-able" ident for the last segment of the `Path`
 fn path_name_to_string(path: &Path<'_>) -> String {
-    path.segments.last().unwrap().ident.name.to_ident_string()
+    path.segments.last().unwrap().ident.to_string()
 }

compiler/rustc_lint/src/pass_by_value.rs

@@ -45,7 +45,7 @@ fn path_for_pass_by_value(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> Option<Stri
     if let TyKind::Path(QPath::Resolved(_, path)) = &ty.kind {
         match path.res {
             Res::Def(_, def_id) if cx.tcx.has_attr(def_id, sym::rustc_pass_by_value) => {
-                let name = cx.tcx.item_name(def_id).to_ident_string();
+                let name = cx.tcx.item_ident(def_id);
                 let path_segment = path.segments.last().unwrap();
                 return Some(format!("{}{}", name, gen_args(cx, path_segment)));
             }

compiler/rustc_mir_transform/src/errors.rs

@@ -5,7 +5,7 @@ use rustc_middle::mir::AssertKind;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint::{self, Lint};
 use rustc_span::def_id::DefId;
-use rustc_span::{Span, Symbol};
+use rustc_span::{Ident, Span, Symbol};
 
 use crate::fluent_generated as fluent;
 
@@ -114,7 +114,7 @@ pub(crate) struct FnItemRef {
     #[suggestion(code = "{sugg}", applicability = "unspecified")]
     pub span: Span,
     pub sugg: String,
-    pub ident: String,
+    pub ident: Ident,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_mir_transform/src/function_item_references.rs

@@ -168,7 +168,7 @@ impl<'tcx> FunctionItemRefChecker<'_, 'tcx> {
                 s
             }
         };
-        let ident = self.tcx.item_name(fn_id).to_ident_string();
+        let ident = self.tcx.item_ident(fn_id);
         let ty_params = fn_args.types().map(|ty| format!("{ty}"));
         let const_params = fn_args.consts().map(|c| format!("{c}"));
         let params = ty_params.chain(const_params).join(", ");
@@ -177,7 +177,7 @@ impl<'tcx> FunctionItemRefChecker<'_, 'tcx> {
         let ret = if fn_sig.output().skip_binder().is_unit() { "" } else { " -> _" };
         let sugg = format!(
             "{} as {}{}fn({}{}){}",
-            if params.is_empty() { ident.clone() } else { format!("{ident}::<{params}>") },
+            if params.is_empty() { ident.to_string() } else { format!("{ident}::<{params}>") },
             unsafety,
             abi,
             vec!["_"; num_args].join(", "),

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1636,13 +1636,12 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                                         .enumerate()
                                         .map(|(idx, new)| (new, old_fields.get(idx)))
                                         .map(|(new, old)| {
-                                            let new = new.name.to_ident_string();
                                             if let Some(Some(old)) = old
-                                                && new != *old
+                                                && new.as_str() != old
                                             {
                                                 format!("{new}: {old}")
                                             } else {
-                                                new
+                                                new.to_string()
                                             }
                                         })
                                         .collect::<Vec<String>>()