diff --git a/clippy_utils/src/ty.rs b/clippy_utils/src/ty.rs
index 897edfc5495..09967f317f8 100644
--- a/clippy_utils/src/ty.rs
+++ b/clippy_utils/src/ty.rs
@@ -1005,14 +1005,12 @@ pub fn make_projection<'tcx>(
 
             debug_assert!(
                 generic_count == substs.len(),
-                "wrong number of substs for `{:?}`: found `{}` expected `{}`.\n\
+                "wrong number of substs for `{:?}`: found `{}` expected `{generic_count}`.\n\
                     note: the expected parameters are: {:#?}\n\
-                    the given arguments are: `{:#?}`",
+                    the given arguments are: `{substs:#?}`",
                 assoc_item.def_id,
                 substs.len(),
-                generic_count,
                 params.map(GenericParamDefKind::descr).collect::<Vec<_>>(),
-                substs,
             );
 
             if let Some((idx, (param, arg))) = params
@@ -1030,14 +1028,11 @@ pub fn make_projection<'tcx>(
             {
                 debug_assert!(
                     false,
-                    "mismatched subst type at index {}: expected a {}, found `{:?}`\n\
+                    "mismatched subst type at index {idx}: expected a {}, found `{arg:?}`\n\
                         note: the expected parameters are {:#?}\n\
-                        the given arguments are {:#?}",
-                    idx,
+                        the given arguments are {substs:#?}",
                     param.descr(),
-                    arg,
-                    params.map(GenericParamDefKind::descr).collect::<Vec<_>>(),
-                    substs,
+                    params.map(GenericParamDefKind::descr).collect::<Vec<_>>()
                 );
             }
         }
diff --git a/lintcheck/src/main.rs b/lintcheck/src/main.rs
index ee8ab7c1d7c..bd49f096072 100644
--- a/lintcheck/src/main.rs
+++ b/lintcheck/src/main.rs
@@ -120,8 +120,8 @@ impl ClippyWarning {
             format!("$CARGO_HOME/{}", stripped.display())
         } else {
             format!(
-                "target/lintcheck/sources/{}-{}/{}",
-                crate_name, crate_version, span.file_name
+                "target/lintcheck/sources/{crate_name}-{crate_version}/{}",
+                span.file_name
             )
         };
 
@@ -322,13 +322,13 @@ impl Crate {
 
         if config.max_jobs == 1 {
             println!(
-                "{}/{} {}% Linting {} {}",
-                index, total_crates_to_lint, perc, &self.name, &self.version
+                "{index}/{total_crates_to_lint} {perc}% Linting {} {}",
+                &self.name, &self.version
             );
         } else {
             println!(
-                "{}/{} {}% Linting {} {} in target dir {:?}",
-                index, total_crates_to_lint, perc, &self.name, &self.version, thread_index
+                "{index}/{total_crates_to_lint} {perc}% Linting {} {} in target dir {thread_index:?}",
+                &self.name, &self.version
             );
         }
 
@@ -398,8 +398,7 @@ impl Crate {
             .output()
             .unwrap_or_else(|error| {
                 panic!(
-                    "Encountered error:\n{:?}\ncargo_clippy_path: {}\ncrate path:{}\n",
-                    error,
+                    "Encountered error:\n{error:?}\ncargo_clippy_path: {}\ncrate path:{}\n",
                     &cargo_clippy_path.display(),
                     &self.path.display()
                 );