4 files changed, 6 insertions, 6 deletions
diff --git a/compiler/rustc_middle/src/lint.rs b/compiler/rustc_middle/src/lint.rs
index 881b14278e9..22e791bb14c 100644
--- a/compiler/rustc_middle/src/lint.rs
+++ b/compiler/rustc_middle/src/lint.rs
@@ -319,7 +319,7 @@ pub fn struct_lint_level<'s, 'd>(
             }
             LintLevelSource::Node(lint_attr_name, src, reason) => {
                 if let Some(rationale) = reason {
-                    err.note(&rationale.as_str());
+                    err.note(rationale.as_str());
                 }
                 sess.diag_span_note_once(
                     &mut err,
diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index afd8083dfe4..96df0525ade 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -2473,7 +2473,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                             if let Some(upvars) = tcx.upvars_mentioned(def_id) {
                                 for (&var_id, place) in iter::zip(upvars.keys(), places) {
                                     let var_name = tcx.hir().name(var_id);
-                                    struct_fmt.field(&var_name.as_str(), place);
+                                    struct_fmt.field(var_name.as_str(), place);
                                 }
                             }
 
@@ -2493,7 +2493,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
                             if let Some(upvars) = tcx.upvars_mentioned(def_id) {
                                 for (&var_id, place) in iter::zip(upvars.keys(), places) {
                                     let var_name = tcx.hir().name(var_id);
-                                    struct_fmt.field(&var_name.as_str(), place);
+                                    struct_fmt.field(var_name.as_str(), place);
                                 }
                             }
 
diff --git a/compiler/rustc_middle/src/mir/mono.rs b/compiler/rustc_middle/src/mir/mono.rs
index f48e27e02cd..facd7abbc9d 100644
--- a/compiler/rustc_middle/src/mir/mono.rs
+++ b/compiler/rustc_middle/src/mir/mono.rs
@@ -338,7 +338,7 @@ impl<'tcx> CodegenUnit<'tcx> {
     }
 
     pub fn work_product_id(&self) -> WorkProductId {
-        WorkProductId::from_cgu_name(&self.name().as_str())
+        WorkProductId::from_cgu_name(self.name().as_str())
     }
 
     pub fn work_product(&self, tcx: TyCtxt<'_>) -> WorkProduct {
@@ -470,7 +470,7 @@ impl CodegenUnitNameBuilder<'tcx> {
         if self.tcx.sess.opts.debugging_opts.human_readable_cgu_names {
             cgu_name
         } else {
-            Symbol::intern(&CodegenUnit::mangle_name(&cgu_name.as_str()))
+            Symbol::intern(&CodegenUnit::mangle_name(cgu_name.as_str()))
         }
     }
 
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index 175295b3199..d4e37fcf642 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -303,7 +303,7 @@ pub trait PrettyPrinter<'tcx>:
         match self.tcx().trimmed_def_paths(()).get(&def_id) {
             None => Ok((self, false)),
             Some(symbol) => {
-                self.write_str(&symbol.as_str())?;
+                self.write_str(symbol.as_str())?;
                 Ok((self, true))
             }
         }