diff --git a/kurobako_core/src/registry.rs b/kurobako_core/src/registry.rs
index 3139f1a..023658d 100644
--- a/kurobako_core/src/registry.rs
+++ b/kurobako_core/src/registry.rs
@@ -6,12 +6,14 @@ use crate::solver::{BoxSolverFactory, SolverRecipe};
 use crate::{Error, Result};
 use std::fmt;
 
+type CreateProblemFactory =
+    dyn Fn(&JsonRecipe, &FactoryRegistry) -> Result<BoxProblemFactory> + Send;
+type CreateSolverFactory = dyn Fn(&JsonRecipe, &FactoryRegistry) -> Result<BoxSolverFactory> + Send;
+
 /// Factory registry.
 pub struct FactoryRegistry {
-    create_problem_factory:
-        Box<dyn Fn(&JsonRecipe, &FactoryRegistry) -> Result<BoxProblemFactory> + Send>,
-    create_solver_factory:
-        Box<dyn Fn(&JsonRecipe, &FactoryRegistry) -> Result<BoxSolverFactory> + Send>,
+    create_problem_factory: Box<CreateProblemFactory>,
+    create_solver_factory: Box<CreateSolverFactory>,
 }
 impl FactoryRegistry {
     /// Makes a new `FactoryRegistry` instance.
diff --git a/kurobako_core/src/rng.rs b/kurobako_core/src/rng.rs
index 5e4d66e..3fccf53 100644
--- a/kurobako_core/src/rng.rs
+++ b/kurobako_core/src/rng.rs
@@ -13,7 +13,7 @@ impl ArcRng {
     /// Makes a new `ArcRng` with the given random seed.
     pub fn new(seed: u64) -> Self {
         let mut seed256 = [0; 32];
-        (&mut seed256[0..8]).copy_from_slice(&seed.to_be_bytes());
+        seed256[0..8].copy_from_slice(&seed.to_be_bytes());
 
         let inner = StdRng::from_seed(seed256);
         Self(Arc::new(Mutex::new(inner)))
diff --git a/kurobako_core/src/trial.rs b/kurobako_core/src/trial.rs
index f66364b..61117c7 100644
--- a/kurobako_core/src/trial.rs
+++ b/kurobako_core/src/trial.rs
@@ -169,16 +169,14 @@ impl PartialOrd for Values {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         let mut ord = None;
         for (a, b) in self.0.iter().zip(other.0.iter()) {
-            if ord == None {
+            if ord.is_none() {
                 ord = a.partial_cmp(b);
-                if ord == None {
-                    return None;
-                }
+                ord?;
             } else if ord != a.partial_cmp(b) {
                 return None;
             }
         }
-        if ord == None {
+        if ord.is_none() {
             Some(Ordering::Equal) // Both instances are empty.
         } else {
             ord
diff --git a/kurobako_problems/src/sigopt.rs b/kurobako_problems/src/sigopt.rs
index 40c9022..ce6064a 100644
--- a/kurobako_problems/src/sigopt.rs
+++ b/kurobako_problems/src/sigopt.rs
@@ -6,6 +6,7 @@
 //! If you want to use an unimplemented function, please create an issue or PR.
 //!
 //! [sigopt/evalset]: https://github.com/sigopt/evalset
+#![allow(clippy::format_push_string)]
 use self::functions::TestFunction;
 use kurobako_core::domain;
 use kurobako_core::problem::{
diff --git a/src/markdown.rs b/src/markdown.rs
index 9646868..4d73cf3 100644
--- a/src/markdown.rs
+++ b/src/markdown.rs
@@ -29,7 +29,7 @@ impl<'a, W: Write> MarkdownWriter<'a, W> {
     }
 
     pub fn inner_mut(&mut self) -> &mut W {
-        &mut self.writer
+        self.writer
     }
 
     pub fn newline(&mut self) -> Result<()> {
diff --git a/src/plot/curve.rs b/src/plot/curve.rs
index 9f89d00..9f158fd 100644
--- a/src/plot/curve.rs
+++ b/src/plot/curve.rs
@@ -1,4 +1,5 @@
 //! `kurobako plot curve` command.
+#![allow(clippy::format_push_string)]
 use super::{execute_gnuplot, normalize_filename};
 use crate::record::{ProblemRecord, StudyRecord};
 use indicatif::{ProgressBar, ProgressStyle};
diff --git a/src/plot/pareto_front.rs b/src/plot/pareto_front.rs
index 32a8418..bacd04c 100644
--- a/src/plot/pareto_front.rs
+++ b/src/plot/pareto_front.rs
@@ -1,4 +1,5 @@
 //! `kurobako plot pareto-front` command.
+#![allow(clippy::format_push_string)]
 use super::{execute_gnuplot, normalize_filename};
 use crate::record::StudyRecord;
 use indicatif::{ProgressBar, ProgressStyle};
diff --git a/src/plot/slice.rs b/src/plot/slice.rs
index d5e544c..1738663 100644
--- a/src/plot/slice.rs
+++ b/src/plot/slice.rs
@@ -1,4 +1,5 @@
 //! `kurobako plot slice` command.
+#![allow(clippy::format_push_string)]
 use super::{execute_gnuplot, normalize_filename};
 use crate::record::StudyRecord;
 use indicatif::{ProgressBar, ProgressStyle};