diff --git a/git-branchless-lib/src/core/effects.rs b/git-branchless-lib/src/core/effects.rs
index 8c50018c9..7f3c0a74b 100644
--- a/git-branchless-lib/src/core/effects.rs
+++ b/git-branchless-lib/src/core/effects.rs
@@ -1,8 +1,7 @@
 //! Wrappers around various side effects.
 
 use bstr::ByteSlice;
-use std::convert::TryInto;
-use std::fmt::{Debug, Write};
+use std::fmt::{Debug, Display, Write};
 use std::io::{stderr, stdout, Stderr, Stdout, Write as WriteIo};
 use std::mem::take;
 use std::sync::{Arc, Mutex, RwLock};
@@ -51,45 +50,46 @@ pub enum OperationType {
     WalkCommits,
 }
 
-impl ToString for OperationType {
-    fn to_string(&self) -> String {
-        let s = match self {
-            OperationType::BuildRebasePlan => "Building rebase plan",
-            OperationType::CalculateDiff => "Computing diffs",
-            OperationType::CalculatePatchId => "Hashing commit contents",
-            OperationType::CheckForCycles => "Checking for cycles",
-            OperationType::ConstrainCommits => "Creating commit constraints",
-            OperationType::DetectDuplicateCommits => "Checking for duplicate commits",
+impl Display for OperationType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            OperationType::BuildRebasePlan => write!(f, "Building rebase plan"),
+            OperationType::CalculateDiff => write!(f, "Computing diffs"),
+            OperationType::CalculatePatchId => write!(f, "Hashing commit contents"),
+            OperationType::CheckForCycles => write!(f, "Checking for cycles"),
+            OperationType::ConstrainCommits => write!(f, "Creating commit constraints"),
+            OperationType::DetectDuplicateCommits => write!(f, "Checking for duplicate commits"),
             OperationType::EvaluateRevset(revset) => {
-                return format!("Evaluating revset: {revset}");
+                write!(f, "Evaluating revset: {revset}")
+            }
+            OperationType::FilterByTouchedPaths => {
+                write!(f, "Filtering upstream commits by touched paths")
             }
-            OperationType::FilterByTouchedPaths => "Filtering upstream commits by touched paths",
-            OperationType::FilterCommits => "Filtering commits",
-            OperationType::FindPathToMergeBase => "Finding path to merge-base",
-            OperationType::GetMergeBase => "Calculating merge-bases",
-            OperationType::GetTouchedPaths => "Getting touched paths",
-            OperationType::GetUpstreamPatchIds => "Enumerating patch IDs",
-            OperationType::InitializeRebase => "Initializing rebase",
-            OperationType::MakeGraph => "Examining local history",
-            OperationType::PushCommits => "Pushing branches",
-            OperationType::ProcessEvents => "Processing events",
-            OperationType::QueryWorkingCopy => "Querying the working copy",
-            OperationType::ReadingFromCache => "Reading from cache",
-            OperationType::RebaseCommits => "Rebasing commits",
-            OperationType::RepairBranches => "Checking for broken branches",
-            OperationType::RepairCommits => "Checking for broken commits",
+            OperationType::FilterCommits => write!(f, "Filtering commits"),
+            OperationType::FindPathToMergeBase => write!(f, "Finding path to merge-base"),
+            OperationType::GetMergeBase => write!(f, "Calculating merge-bases"),
+            OperationType::GetTouchedPaths => write!(f, "Getting touched paths"),
+            OperationType::GetUpstreamPatchIds => write!(f, "Enumerating patch IDs"),
+            OperationType::InitializeRebase => write!(f, "Initializing rebase"),
+            OperationType::MakeGraph => write!(f, "Examining local history"),
+            OperationType::PushCommits => write!(f, "Pushing branches"),
+            OperationType::ProcessEvents => write!(f, "Processing events"),
+            OperationType::QueryWorkingCopy => write!(f, "Querying the working copy"),
+            OperationType::ReadingFromCache => write!(f, "Reading from cache"),
+            OperationType::RebaseCommits => write!(f, "Rebasing commits"),
+            OperationType::RepairBranches => write!(f, "Checking for broken branches"),
+            OperationType::RepairCommits => write!(f, "Checking for broken commits"),
             OperationType::RunGitCommand(command) => {
-                return format!("Running Git command: {}", &command)
+                write!(f, "Running Git command: {}", &command)
             }
-            OperationType::RunTests(command) => return format!("Running command: {command}"),
-            OperationType::RunTestOnCommit(commit) => return format!("Waiting to run on {commit}"),
-            OperationType::SortCommits => "Sorting commits",
-            OperationType::SyncCommits => "Syncing commit stacks",
-            OperationType::UpdateCommits => "Updating commits",
-            OperationType::UpdateCommitGraph => "Updating commit graph",
-            OperationType::WalkCommits => "Walking commits",
-        };
-        s.to_string()
+            OperationType::RunTests(command) => write!(f, "Running command: {command}"),
+            OperationType::RunTestOnCommit(commit) => write!(f, "Waiting to run on {commit}"),
+            OperationType::SortCommits => write!(f, "Sorting commits"),
+            OperationType::SyncCommits => write!(f, "Syncing commit stacks"),
+            OperationType::UpdateCommits => write!(f, "Updating commits"),
+            OperationType::UpdateCommitGraph => write!(f, "Updating commit graph"),
+            OperationType::WalkCommits => write!(f, "Walking commits"),
+        }
     }
 }
 
diff --git a/git-branchless-lib/src/core/eventlog.rs b/git-branchless-lib/src/core/eventlog.rs
index bcdc214d1..6e44403e7 100644
--- a/git-branchless-lib/src/core/eventlog.rs
+++ b/git-branchless-lib/src/core/eventlog.rs
@@ -9,6 +9,7 @@ use std::cmp::Ordering;
 use std::collections::{HashMap, HashSet};
 use std::convert::{TryFrom, TryInto};
 
+use std::fmt::Display;
 use std::str::FromStr;
 use std::time::{Duration, SystemTime};
 
@@ -62,11 +63,11 @@ pub enum EventTransactionId {
     Suppressed,
 }
 
-impl ToString for EventTransactionId {
-    fn to_string(&self) -> String {
+impl Display for EventTransactionId {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            EventTransactionId::Id(event_id) => event_id.to_string(),
-            EventTransactionId::Suppressed => "SUPPRESSED".to_string(),
+            EventTransactionId::Id(event_id) => write!(f, "{event_id}"),
+            EventTransactionId::Suppressed => write!(f, "SUPPRESSED"),
         }
     }
 }
diff --git a/git-branchless-lib/src/core/rewrite/execute.rs b/git-branchless-lib/src/core/rewrite/execute.rs
index 46b861443..daa7684d7 100644
--- a/git-branchless-lib/src/core/rewrite/execute.rs
+++ b/git-branchless-lib/src/core/rewrite/execute.rs
@@ -1103,7 +1103,7 @@ mod on_disk {
             rebase_plan
                 .commands
                 .iter()
-                .map(|command| format!("{}\n", command.to_string()))
+                .map(|command| format!("{}\n", command.to_rebase_command()))
                 .collect::<String>(),
         )
         .wrap_err_with(|| {
diff --git a/git-branchless-lib/src/core/rewrite/plan.rs b/git-branchless-lib/src/core/rewrite/plan.rs
index 5ebae0a98..00307ec37 100644
--- a/git-branchless-lib/src/core/rewrite/plan.rs
+++ b/git-branchless-lib/src/core/rewrite/plan.rs
@@ -125,20 +125,10 @@ pub enum RebaseCommand {
     },
 }
 
-/// Represents a sequence of commands that can be executed to carry out a rebase
-/// operation.
-#[derive(Debug)]
-pub struct RebasePlan {
-    /// The first commit OID that will be checked out. This is necessary to
-    /// support on-disk rebases.
-    pub first_dest_oid: NonZeroOid,
-
-    /// The commands to run.
-    pub commands: Vec<RebaseCommand>,
-}
-
-impl ToString for RebaseCommand {
-    fn to_string(&self) -> String {
+impl RebaseCommand {
+    /// Convert the command to a string that's used in the `git rebase` plan
+    /// format.
+    pub fn to_rebase_command(&self) -> String {
         match self {
             RebaseCommand::CreateLabel { label_name } => format!("label {label_name}"),
             RebaseCommand::Reset { target } => format!("reset {target}"),
@@ -195,6 +185,18 @@ impl ToString for RebaseCommand {
     }
 }
 
+/// Represents a sequence of commands that can be executed to carry out a rebase
+/// operation.
+#[derive(Debug)]
+pub struct RebasePlan {
+    /// The first commit OID that will be checked out. This is necessary to
+    /// support on-disk rebases.
+    pub first_dest_oid: NonZeroOid,
+
+    /// The commands to run.
+    pub commands: Vec<RebaseCommand>,
+}
+
 /// A token representing that the rebase plan has been checked for validity.
 #[derive(Clone, Debug)]
 pub struct RebasePlanPermissions {
diff --git a/git-branchless-lib/src/git/index.rs b/git-branchless-lib/src/git/index.rs
index 9082d0a5c..f83c3dd20 100644
--- a/git-branchless-lib/src/git/index.rs
+++ b/git-branchless-lib/src/git/index.rs
@@ -141,7 +141,6 @@ pub fn update_index(
                     write!(
                         &mut buf,
                         "{mode} {sha1} {stage}\t{path}\0",
-                        mode = mode.to_string(),
                         sha1 = oid,
                         stage = i32::from(*stage),
                         path = path.display(),
diff --git a/git-branchless-lib/src/git/status.rs b/git-branchless-lib/src/git/status.rs
index 601c3d689..72ba3368b 100644
--- a/git-branchless-lib/src/git/status.rs
+++ b/git-branchless-lib/src/git/status.rs
@@ -1,3 +1,4 @@
+use std::fmt::Display;
 use std::path::PathBuf;
 use std::str::FromStr;
 
@@ -146,16 +147,16 @@ impl FromStr for FileMode {
     }
 }
 
-impl ToString for FileMode {
-    fn to_string(&self) -> String {
+impl Display for FileMode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            FileMode::Unreadable => "000000".to_string(),
-            FileMode::Tree => "040000".to_string(),
-            FileMode::Blob => "100644".to_string(),
-            FileMode::BlobExecutable => "100755".to_string(),
-            FileMode::BlobGroupWritable => "100664".to_string(),
-            FileMode::Link => "120000".to_string(),
-            FileMode::Commit => "160000".to_string(),
+            FileMode::Unreadable => write!(f, "000000"),
+            FileMode::Tree => write!(f, "040000"),
+            FileMode::Blob => write!(f, "100644"),
+            FileMode::BlobExecutable => write!(f, "100755"),
+            FileMode::BlobGroupWritable => write!(f, "100664"),
+            FileMode::Link => write!(f, "120000"),
+            FileMode::Commit => write!(f, "160000"),
         }
     }
 }
diff --git a/git-branchless-revset/src/eval.rs b/git-branchless-revset/src/eval.rs
index dce037baf..63e18867b 100644
--- a/git-branchless-revset/src/eval.rs
+++ b/git-branchless-revset/src/eval.rs
@@ -350,7 +350,6 @@ pub(super) fn eval_number_rhs(
 mod tests {
     use std::borrow::Cow;
 
-    use lib::core::effects::Effects;
     use lib::core::eventlog::{EventLogDb, EventReplayer};
     use lib::core::formatting::Glyphs;
     use lib::core::repo_ext::RepoExt;
@@ -358,7 +357,6 @@ mod tests {
     use lib::testing::{make_git, GitRunOptions};
 
     use super::*;
-    use crate::Expr;
 
     fn eval_and_sort<'a>(
         effects: &Effects,
diff --git a/git-branchless-revset/src/lib.rs b/git-branchless-revset/src/lib.rs
index 4dc82ceec..14efa735a 100644
--- a/git-branchless-revset/src/lib.rs
+++ b/git-branchless-revset/src/lib.rs
@@ -24,7 +24,7 @@ pub use resolve::{check_revset_syntax, resolve_commits, resolve_default_smartlog
 
 use lalrpop_util::lalrpop_mod;
 lalrpop_mod!(
-    #[allow(clippy::all, clippy::as_conversions)]
+    #[allow(clippy::all, clippy::as_conversions, dead_code)]
     grammar,
     "/grammar.rs"
 );
diff --git a/git-branchless-submit/src/github.rs b/git-branchless-submit/src/github.rs
index 2e8abbbb7..39eef9c06 100644
--- a/git-branchless-submit/src/github.rs
+++ b/git-branchless-submit/src/github.rs
@@ -826,6 +826,7 @@ mod client {
 
     #[derive(Debug)]
     pub struct RealGithubClient {
+        #[allow(dead_code)] // FIXME: destructure and use in `run_gh`?
         pub gh_run_info: GitRunInfo,
     }
 
@@ -996,7 +997,7 @@ mod client {
                     "--title",
                     &title,
                     "--body-file",
-                    &body_file.path().to_str().unwrap(),
+                    (body_file.path().to_str().unwrap()),
                 ],
             )?);
             Ok(Ok(()))
diff --git a/git-branchless-submit/tests/test_github_forge.rs b/git-branchless-submit/tests/test_github_forge.rs
index 6778beab5..2187c2b19 100644
--- a/git-branchless-submit/tests/test_github_forge.rs
+++ b/git-branchless-submit/tests/test_github_forge.rs
@@ -447,7 +447,7 @@ fn test_github_forge_no_include_unsubmitted_commits_in_stack() -> eyre::Result<(
     {
         let (stdout, _stderr) = local_repo.branchless_with_options(
             "submit",
-            &[&"--forge", "github", "--create", "HEAD^^"],
+            &["--forge", "github", "--create", "HEAD^^"],
             &GitRunOptions {
                 env: mock_env(&remote_repo),
                 ..Default::default()
@@ -537,7 +537,7 @@ fn test_github_forge_multiple_commits_in_pull_request() -> eyre::Result<()> {
     {
         let (stdout, _stderr) = local_repo.branchless_with_options(
             "submit",
-            &[&"--forge", "github", "--create", "HEAD"],
+            &["--forge", "github", "--create", "HEAD"],
             &GitRunOptions {
                 env: mock_env(&remote_repo),
                 ..Default::default()
diff --git a/git-branchless-undo/src/tui/testing.rs b/git-branchless-undo/src/tui/testing.rs
index b8593b517..4ae5e6a05 100644
--- a/git-branchless-undo/src/tui/testing.rs
+++ b/git-branchless-undo/src/tui/testing.rs
@@ -57,7 +57,7 @@ impl Backend for CursiveTestingBackend {
         match self.events.get(event_index)?.to_owned() {
             CursiveTestingEvent::TakeScreenshot(screen_target) => {
                 let mut screen_target = (*screen_target).borrow_mut();
-                *screen_target = self.screen.borrow().clone();
+                screen_target.clone_from(&self.screen.borrow());
                 self.poll_event()
             }
             CursiveTestingEvent::Event(event) => {