2 files changed, 8 insertions, 8 deletions
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index 71c93d05792..c41a8318ec5 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -1975,7 +1975,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
                         min_size = field_end;
                     }
                     FieldInfo {
-                        name: name.to_string(),
+                        name,
                         offset: offset.bytes(),
                         size: field_layout.size.bytes(),
                         align: field_layout.align.abi.bytes(),
@@ -1984,7 +1984,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
                 .collect();
 
             VariantInfo {
-                name: n.map(|n| n.to_string()),
+                name: n,
                 kind: if layout.is_unsized() { SizeKind::Min } else { SizeKind::Exact },
                 align: layout.align.abi.bytes(),
                 size: if min_size.bytes() == 0 { layout.size.bytes() } else { min_size.bytes() },
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index 81c4d2ae346..96e84bc8f0a 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -1030,11 +1030,11 @@ pub trait PrettyPrinter<'tcx>:
         }
     }
 
-    fn ty_infer_name(&self, _: ty::TyVid) -> Option<String> {
+    fn ty_infer_name(&self, _: ty::TyVid) -> Option<Symbol> {
         None
     }
 
-    fn const_infer_name(&self, _: ty::ConstVid<'tcx>) -> Option<String> {
+    fn const_infer_name(&self, _: ty::ConstVid<'tcx>) -> Option<Symbol> {
         None
     }
 
@@ -1550,8 +1550,8 @@ pub struct FmtPrinterData<'a, 'tcx> {
 
     pub region_highlight_mode: RegionHighlightMode<'tcx>,
 
-    pub ty_infer_name_resolver: Option<Box<dyn Fn(ty::TyVid) -> Option<String> + 'a>>,
-    pub const_infer_name_resolver: Option<Box<dyn Fn(ty::ConstVid<'tcx>) -> Option<String> + 'a>>,
+    pub ty_infer_name_resolver: Option<Box<dyn Fn(ty::TyVid) -> Option<Symbol> + 'a>>,
+    pub const_infer_name_resolver: Option<Box<dyn Fn(ty::ConstVid<'tcx>) -> Option<Symbol> + 'a>>,
 }
 
 impl<'a, 'tcx> Deref for FmtPrinter<'a, 'tcx> {
@@ -1841,11 +1841,11 @@ impl<'tcx> Printer<'tcx> for FmtPrinter<'_, 'tcx> {
 }
 
 impl<'tcx> PrettyPrinter<'tcx> for FmtPrinter<'_, 'tcx> {
-    fn ty_infer_name(&self, id: ty::TyVid) -> Option<String> {
+    fn ty_infer_name(&self, id: ty::TyVid) -> Option<Symbol> {
         self.0.ty_infer_name_resolver.as_ref().and_then(|func| func(id))
     }
 
-    fn const_infer_name(&self, id: ty::ConstVid<'tcx>) -> Option<String> {
+    fn const_infer_name(&self, id: ty::ConstVid<'tcx>) -> Option<Symbol> {
         self.0.const_infer_name_resolver.as_ref().and_then(|func| func(id))
     }