diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6039e14..88e243a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -26,7 +26,7 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         components: clippy, rustfmt
-        toolchain: 1.56.0
+        toolchain: stable
 
     - uses: Swatinem/rust-cache@v1
 
@@ -63,7 +63,7 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: 1.56.0
+        toolchain: stable
 
     - uses: Swatinem/rust-cache@v1
 
@@ -123,7 +123,7 @@ jobs:
       with:
         components: clippy, rustfmt
         override: true
-        toolchain: 1.56.0
+        toolchain: stable
 
     - uses: Swatinem/rust-cache@v1
 
diff --git a/Cargo.lock b/Cargo.lock
index 814d95b..146e4ed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -317,7 +317,6 @@ dependencies = [
  "env_logger",
  "executable-path",
  "heck 0.4.0",
- "lazy_static",
  "lexiclean",
  "libc",
  "log",
diff --git a/Cargo.toml b/Cargo.toml
index 2dfc7d6..09c3575 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,6 @@ dotenvy = "0.15"
 edit-distance = "2.0.0"
 env_logger = "0.9.3"
 heck = "0.4.0"
-lazy_static = "1.0.0"
 lexiclean = "0.0.1"
 libc = "0.2.0"
 log = "0.4.4"
diff --git a/README.md b/README.md
index c440bd1..8740da4 100644
--- a/README.md
+++ b/README.md
@@ -2421,7 +2421,7 @@ Before merging a particularly large or gruesome change, Janus should be run to m
 
 ### Minimum Supported Rust Version
 
-The minimum supported Rust version, or MSRV, is Rust 1.56.0.
+The minimum supported Rust version, or MSRV, is current stable Rust. It may build on older versions of Rust, but this is not guaranteed.
 
 ### New Releases
 
diff --git a/bin/generate-book/src/main.rs b/bin/generate-book/src/main.rs
index bb05954..3076f20 100644
--- a/bin/generate-book/src/main.rs
+++ b/bin/generate-book/src/main.rs
@@ -165,7 +165,7 @@ fn main() -> Result {
 
     for chapter in chapters {
       let path = format!("{}/chapter_{}.md", src, chapter.number());
-      fs::write(&path, &chapter.markdown()?)?;
+      fs::write(path, chapter.markdown()?)?;
       let indent = match chapter.level {
         HeadingLevel::H1 => 0,
         HeadingLevel::H2 => 1,
diff --git a/src/assignment_resolver.rs b/src/assignment_resolver.rs
index 777035e..173c174 100644
--- a/src/assignment_resolver.rs
+++ b/src/assignment_resolver.rs
@@ -36,7 +36,7 @@ impl<'src: 'run, 'run> AssignmentResolver<'src, 'run> {
       self.resolve_expression(&assignment.value)?;
       self.evaluated.insert(name);
     } else {
-      let message = format!("attempted to resolve unknown assignment `{}`", name);
+      let message = format!("attempted to resolve unknown assignment `{name}`");
       let token = Token {
         src: "",
         offset: 0,
diff --git a/src/ast.rs b/src/ast.rs
index cca0f63..18c3e45 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -16,7 +16,7 @@ impl<'src> Display for Ast<'src> {
     let mut iter = self.items.iter().peekable();
 
     while let Some(item) = iter.next() {
-      writeln!(f, "{}", item)?;
+      writeln!(f, "{item}")?;
 
       if let Some(next_item) = iter.peek() {
         if matches!(item, Item::Recipe(_))
diff --git a/src/compile_error.rs b/src/compile_error.rs
index abdb934..4464c61 100644
--- a/src/compile_error.rs
+++ b/src/compile_error.rs
@@ -39,7 +39,7 @@ impl Display for CompileError<'_> {
       }
       CircularRecipeDependency { recipe, ref circle } => {
         if circle.len() == 2 {
-          write!(f, "Recipe `{}` depends on itself", recipe)?;
+          write!(f, "Recipe `{recipe}` depends on itself")?;
         } else {
           write!(
             f,
@@ -54,7 +54,7 @@ impl Display for CompileError<'_> {
         ref circle,
       } => {
         if circle.len() == 2 {
-          write!(f, "Variable `{}` is defined in terms of itself", variable)?;
+          write!(f, "Variable `{variable}` is defined in terms of itself")?;
         } else {
           write!(
             f,
@@ -80,11 +80,11 @@ impl Display for CompileError<'_> {
 
         if min == max {
           let expected = min;
-          write!(f, "{} {}", expected, Count("argument", *expected))?;
+          write!(f, "{expected} {}", Count("argument", *expected))?;
         } else if found < min {
-          write!(f, "at least {} {}", min, Count("argument", *min))?;
+          write!(f, "at least {min} {}", Count("argument", *min))?;
         } else {
-          write!(f, "at most {} {}", max, Count("argument", *max))?;
+          write!(f, "at most {max} {}", Count("argument", *max))?;
         }
       }
       DuplicateAlias { alias, first } => {
@@ -131,7 +131,7 @@ impl Display for CompileError<'_> {
         )?;
       }
       DuplicateVariable { variable } => {
-        write!(f, "Variable `{}` has multiple definitions", variable)?;
+        write!(f, "Variable `{variable}` has multiple definitions")?;
       }
       ExpectedKeyword { expected, found } => {
         if found.kind == TokenKind::Identifier {
@@ -192,7 +192,7 @@ impl Display for CompileError<'_> {
           '"' => r#"""#.to_owned(),
           _ => character.escape_default().collect(),
         };
-        write!(f, "`\\{}` is not a valid escape sequence", representation)?;
+        write!(f, "`\\{representation}` is not a valid escape sequence")?;
       }
       MismatchedClosingDelimiter {
         open,
@@ -216,13 +216,12 @@ impl Display for CompileError<'_> {
         )?;
       }
       ParameterFollowsVariadicParameter { parameter } => {
-        write!(f, "Parameter `{}` follows variadic parameter", parameter)?;
+        write!(f, "Parameter `{parameter}` follows variadic parameter")?;
       }
       ParameterShadowsVariable { parameter } => {
         write!(
           f,
-          "Parameter `{}` shadows variable of the same name",
-          parameter
+          "Parameter `{parameter}` shadows variable of the same name",
         )?;
       }
       ParsingRecursionDepthExceeded => {
@@ -236,41 +235,37 @@ impl Display for CompileError<'_> {
         )?;
       }
       UndefinedVariable { variable } => {
-        write!(f, "Variable `{}` not defined", variable)?;
+        write!(f, "Variable `{variable}` not defined")?;
       }
       UnexpectedCharacter { expected } => {
-        write!(f, "Expected character `{}`", expected)?;
+        write!(f, "Expected character `{expected}`")?;
       }
       UnexpectedClosingDelimiter { close } => {
         write!(f, "Unexpected closing delimiter `{}`", close.close())?;
       }
       UnexpectedEndOfToken { expected } => {
-        write!(f, "Expected character `{}` but found end-of-file", expected)?;
+        write!(f, "Expected character `{expected}` but found end-of-file")?;
       }
       UnexpectedToken {
         ref expected,
         found,
       } => {
-        write!(f, "Expected {}, but found {}", List::or(expected), found)?;
+        write!(f, "Expected {}, but found {found}", List::or(expected))?;
       }
       UnknownAliasTarget { alias, target } => {
-        write!(f, "Alias `{}` has an unknown target `{}`", alias, target)?;
+        write!(f, "Alias `{alias}` has an unknown target `{target}`")?;
       }
       UnknownAttribute { attribute } => {
-        write!(f, "Unknown attribute `{}`", attribute)?;
+        write!(f, "Unknown attribute `{attribute}`")?;
       }
       UnknownDependency { recipe, unknown } => {
-        write!(
-          f,
-          "Recipe `{}` has unknown dependency `{}`",
-          recipe, unknown
-        )?;
+        write!(f, "Recipe `{recipe}` has unknown dependency `{unknown}`",)?;
       }
       UnknownFunction { function } => {
-        write!(f, "Call to unknown function `{}`", function)?;
+        write!(f, "Call to unknown function `{function}`")?;
       }
       UnknownSetting { setting } => {
-        write!(f, "Unknown setting `{}`", setting)?;
+        write!(f, "Unknown setting `{setting}`")?;
       }
       UnknownStartOfToken => {
         write!(f, "Unknown start of token:")?;
diff --git a/src/config.rs b/src/config.rs
index f27b98e..9416daa 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -388,7 +388,7 @@ impl Config {
       arg::COLOR_ALWAYS => Ok(Color::always()),
       arg::COLOR_NEVER => Ok(Color::never()),
       _ => Err(ConfigError::Internal {
-        message: format!("Invalid argument `{}` to --color.", value),
+        message: format!("Invalid argument `{value}` to --color."),
       }),
     }
   }
@@ -404,7 +404,7 @@ impl Config {
       arg::DUMP_FORMAT_JSON => Ok(DumpFormat::Json),
       arg::DUMP_FORMAT_JUST => Ok(DumpFormat::Just),
       _ => Err(ConfigError::Internal {
-        message: format!("Invalid argument `{}` to --dump-format.", value),
+        message: format!("Invalid argument `{value}` to --dump-format."),
       }),
     }
   }
diff --git a/src/config_error.rs b/src/config_error.rs
index 84f844a..36a2274 100644
--- a/src/config_error.rs
+++ b/src/config_error.rs
@@ -28,7 +28,7 @@ pub(crate) enum ConfigError {
   #[snafu(display(
       "`--{}` used with unexpected overrides: {}",
       subcommand.to_lowercase(),
-      List::and_ticked(overrides.iter().map(|(key, value)| format!("{}={}", key, value))),
+      List::and_ticked(overrides.iter().map(|(key, value)| format!("{key}={value}"))),
   ))]
   SubcommandOverrides {
     subcommand: &'static str,
@@ -37,7 +37,7 @@ pub(crate) enum ConfigError {
   #[snafu(display(
       "`--{}` used with unexpected overrides: {}; and arguments: {}",
       subcommand.to_lowercase(),
-      List::and_ticked(overrides.iter().map(|(key, value)| format!("{}={}", key, value))),
+      List::and_ticked(overrides.iter().map(|(key, value)| format!("{key}={value}"))),
       List::and_ticked(arguments)))
   ]
   SubcommandOverridesAndArguments {
diff --git a/src/dependency.rs b/src/dependency.rs
index 3039949..2d1da11 100644
--- a/src/dependency.rs
+++ b/src/dependency.rs
@@ -15,7 +15,7 @@ impl<'src> Display for Dependency<'src> {
       write!(f, "({}", self.recipe.name())?;
 
       for argument in &self.arguments {
-        write!(f, " {}", argument)?;
+        write!(f, " {argument}")?;
       }
 
       write!(f, ")")
diff --git a/src/error.rs b/src/error.rs
index ad13b2f..15e42b9 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -256,10 +256,10 @@ impl<'src> ColorDisplay for Error<'src> {
       }
       Backtick { output_error, .. } => match output_error {
         OutputError::Code(code) => {
-          write!(f, "Backtick failed with exit code {}", code)?;
+          write!(f, "Backtick failed with exit code {code}")?;
         }
         OutputError::Signal(signal) => {
-          write!(f, "Backtick was terminated by signal {}", signal)?;
+          write!(f, "Backtick was terminated by signal {signal}")?;
         }
         OutputError::Unknown => {
           write!(f, "Backtick failed for an unknown reason")?;
@@ -343,7 +343,7 @@ impl<'src> ColorDisplay for Error<'src> {
             recipe, n, code
           )?;
         } else {
-          write!(f, "Recipe `{}` failed with exit code {}", recipe, code)?;
+          write!(f, "Recipe `{recipe}` failed with exit code {code}")?;
         }
       }
       CommandInvoke {
@@ -422,7 +422,7 @@ impl<'src> ColorDisplay for Error<'src> {
                path:\n{}",
               recipe, io_error
             ),
-            _ => write!(f, "Could not run `cygpath` executable:\n{}", io_error),
+            _ => write!(f, "Could not run `cygpath` executable:\n{io_error}"),
           }?;
         }
         OutputError::Utf8(utf8_error) => {
@@ -447,34 +447,28 @@ impl<'src> ColorDisplay for Error<'src> {
         )?;
       }
       Dotenv { dotenv_error } => {
-        write!(f, "Failed to load environment file: {}", dotenv_error)?;
+        write!(f, "Failed to load environment file: {dotenv_error}")?;
       }
       DumpJson { serde_json_error } => {
-        write!(f, "Failed to dump JSON to stdout: {}", serde_json_error)?;
+        write!(f, "Failed to dump JSON to stdout: {serde_json_error}")?;
       }
       EditorInvoke { editor, io_error } => {
         write!(
           f,
-          "Editor `{}` invocation failed: {}",
+          "Editor `{}` invocation failed: {io_error}",
           editor.to_string_lossy(),
-          io_error
         )?;
       }
       EditorStatus { editor, status } => {
-        write!(
-          f,
-          "Editor `{}` failed: {}",
-          editor.to_string_lossy(),
-          status
-        )?;
+        write!(f, "Editor `{}` failed: {status}", editor.to_string_lossy(),)?;
       }
       EvalUnknownVariable {
         variable,
         suggestion,
       } => {
-        write!(f, "Justfile does not contain variable `{}`.", variable,)?;
+        write!(f, "Justfile does not contain variable `{variable}`.")?;
         if let Some(suggestion) = *suggestion {
-          write!(f, "\n{}", suggestion)?;
+          write!(f, "\n{suggestion}")?;
         }
       }
       FormatCheckFoundDiff => {
@@ -533,7 +527,7 @@ impl<'src> ColorDisplay for Error<'src> {
         write!(f, "Justfile contains no recipes.")?;
       }
       RegexCompile { source } => {
-        write!(f, "{}", source)?;
+        write!(f, "{source}")?;
       }
       Search { search_error } => Display::fmt(search_error, f)?,
       Shebang {
@@ -545,14 +539,12 @@ impl<'src> ColorDisplay for Error<'src> {
         if let Some(argument) = argument {
           write!(
             f,
-            "Recipe `{}` with shebang `#!{} {}` execution error: {}",
-            recipe, command, argument, io_error
+            "Recipe `{recipe}` with shebang `#!{command} {argument}` execution error: {io_error}",
           )?;
         } else {
           write!(
             f,
-            "Recipe `{}` with shebang `#!{}` execution error: {}",
-            recipe, command, io_error
+            "Recipe `{recipe}` with shebang `#!{command}` execution error: {io_error}",
           )?;
         }
       }
@@ -564,18 +556,16 @@ impl<'src> ColorDisplay for Error<'src> {
         if let Some(n) = line_number {
           write!(
             f,
-            "Recipe `{}` was terminated on line {} by signal {}",
-            recipe, n, signal
+            "Recipe `{recipe}` was terminated on line {n} by signal {signal}",
           )?;
         } else {
-          write!(f, "Recipe `{}` was terminated by signal {}", recipe, signal)?;
+          write!(f, "Recipe `{recipe}` was terminated by signal {signal}")?;
         }
       }
       TmpdirIo { recipe, io_error } => write!(
         f,
-        "Recipe `{}` could not be run because of an IO error while trying to create a temporary \
-         directory or write a file to that directory`:{}",
-        recipe, io_error
+        "Recipe `{recipe}` could not be run because of an IO error while trying to create a temporary \
+         directory or write a file to that directory`:{io_error}",
       )?,
       Unknown {
         recipe,
@@ -584,11 +574,10 @@ impl<'src> ColorDisplay for Error<'src> {
         if let Some(n) = line_number {
           write!(
             f,
-            "Recipe `{}` failed on line {} for an unknown reason",
-            recipe, n
+            "Recipe `{recipe}` failed on line {n} for an unknown reason",
           )?;
         } else {
-          write!(f, "Recipe `{}` failed for an unknown reason", recipe)?;
+          write!(f, "Recipe `{recipe}` failed for an unknown reason")?;
         }
       }
       UnknownOverrides { overrides } => {
@@ -610,7 +599,7 @@ impl<'src> ColorDisplay for Error<'src> {
           List::or_ticked(recipes),
         )?;
         if let Some(suggestion) = *suggestion {
-          write!(f, "\n{}", suggestion)?;
+          write!(f, "\n{suggestion}")?;
         }
       }
       Unstable { message } => {
diff --git a/src/evaluator.rs b/src/evaluator.rs
index 2d4cb75..c3ae8a0 100644
--- a/src/evaluator.rs
+++ b/src/evaluator.rs
@@ -61,7 +61,7 @@ impl<'src, 'run> Evaluator<'src, 'run> {
           Ok(self.evaluate_assignment(assignment)?.to_owned())
         } else {
           Err(Error::Internal {
-            message: format!("attempted to evaluate undefined variable `{}`", variable),
+            message: format!("attempted to evaluate undefined variable `{variable}`"),
           })
         }
       }
@@ -145,7 +145,7 @@ impl<'src, 'run> Evaluator<'src, 'run> {
       Expression::StringLiteral { string_literal } => Ok(string_literal.cooked.clone()),
       Expression::Backtick { contents, token } => {
         if self.config.dry_run {
-          Ok(format!("`{}`", contents))
+          Ok(format!("`{contents}`"))
         } else {
           Ok(self.run_backtick(contents, token)?)
         }
diff --git a/src/expression.rs b/src/expression.rs
index 4c0be54..32604c1 100644
--- a/src/expression.rs
+++ b/src/expression.rs
@@ -51,12 +51,12 @@ impl<'src> Display for Expression<'src> {
   fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
     match self {
       Expression::Backtick { token, .. } => write!(f, "{}", token.lexeme()),
-      Expression::Join { lhs: None, rhs } => write!(f, "/ {}", rhs),
+      Expression::Join { lhs: None, rhs } => write!(f, "/ {rhs}"),
       Expression::Join {
         lhs: Some(lhs),
         rhs,
-      } => write!(f, "{} / {}", lhs, rhs),
-      Expression::Concatenation { lhs, rhs } => write!(f, "{} + {}", lhs, rhs),
+      } => write!(f, "{lhs} / {rhs}"),
+      Expression::Concatenation { lhs, rhs } => write!(f, "{lhs} + {rhs}"),
       Expression::Conditional {
         lhs,
         rhs,
@@ -68,10 +68,10 @@ impl<'src> Display for Expression<'src> {
         "if {} {} {} {{ {} }} else {{ {} }}",
         lhs, operator, rhs, then, otherwise
       ),
-      Expression::StringLiteral { string_literal } => write!(f, "{}", string_literal),
+      Expression::StringLiteral { string_literal } => write!(f, "{string_literal}"),
       Expression::Variable { name } => write!(f, "{}", name.lexeme()),
-      Expression::Call { thunk } => write!(f, "{}", thunk),
-      Expression::Group { contents } => write!(f, "({})", contents),
+      Expression::Call { thunk } => write!(f, "{thunk}"),
+      Expression::Group { contents } => write!(f, "({contents})"),
     }
   }
 }
diff --git a/src/function.rs b/src/function.rs
index 18f000b..9286e20 100644
--- a/src/function.rs
+++ b/src/function.rs
@@ -9,6 +9,7 @@ use heck::{
 };
 
 use Function::*;
+
 pub(crate) enum Function {
   Nullary(fn(&FunctionContext) -> Result<String, String>),
   Unary(fn(&FunctionContext, &str) -> Result<String, String>),
@@ -17,53 +18,53 @@ pub(crate) enum Function {
   Ternary(fn(&FunctionContext, &str, &str, &str) -> Result<String, String>),
 }
 
-lazy_static! {
-  pub(crate) static ref TABLE: BTreeMap<&'static str, Function> = vec![
-    ("absolute_path", Unary(absolute_path)),
-    ("arch", Nullary(arch)),
-    ("capitalize", Unary(capitalize)),
-    ("clean", Unary(clean)),
-    ("env_var", Unary(env_var)),
-    ("env_var_or_default", Binary(env_var_or_default)),
-    ("error", Unary(error)),
-    ("extension", Unary(extension)),
-    ("file_name", Unary(file_name)),
-    ("file_stem", Unary(file_stem)),
-    ("invocation_directory", Nullary(invocation_directory)),
-    ("join", BinaryPlus(join)),
-    ("just_executable", Nullary(just_executable)),
-    ("justfile", Nullary(justfile)),
-    ("justfile_directory", Nullary(justfile_directory)),
-    ("kebabcase", Unary(kebabcase)),
-    ("lowercamelcase", Unary(lowercamelcase)),
-    ("lowercase", Unary(lowercase)),
-    ("os", Nullary(os)),
-    ("os_family", Nullary(os_family)),
-    ("parent_directory", Unary(parent_directory)),
-    ("path_exists", Unary(path_exists)),
-    ("quote", Unary(quote)),
-    ("replace", Ternary(replace)),
-    ("replace_regex", Ternary(replace_regex)),
-    ("sha256", Unary(sha256)),
-    ("sha256_file", Unary(sha256_file)),
-    ("shoutykebabcase", Unary(shoutykebabcase)),
-    ("shoutysnakecase", Unary(shoutysnakecase)),
-    ("snakecase", Unary(snakecase)),
-    ("titlecase", Unary(titlecase)),
-    ("trim", Unary(trim)),
-    ("trim_end", Unary(trim_end)),
-    ("trim_end_match", Binary(trim_end_match)),
-    ("trim_end_matches", Binary(trim_end_matches)),
-    ("trim_start", Unary(trim_start)),
-    ("trim_start_match", Binary(trim_start_match)),
-    ("trim_start_matches", Binary(trim_start_matches)),
-    ("uppercamelcase", Unary(uppercamelcase)),
-    ("uppercase", Unary(uppercase)),
-    ("uuid", Nullary(uuid)),
-    ("without_extension", Unary(without_extension)),
-  ]
-  .into_iter()
-  .collect();
+pub(crate) fn get(name: &str) -> Option<Function> {
+  let function = match name {
+    "absolute_path" => Unary(absolute_path),
+    "arch" => Nullary(arch),
+    "capitalize" => Unary(capitalize),
+    "clean" => Unary(clean),
+    "env_var" => Unary(env_var),
+    "env_var_or_default" => Binary(env_var_or_default),
+    "error" => Unary(error),
+    "extension" => Unary(extension),
+    "file_name" => Unary(file_name),
+    "file_stem" => Unary(file_stem),
+    "invocation_directory" => Nullary(invocation_directory),
+    "join" => BinaryPlus(join),
+    "just_executable" => Nullary(just_executable),
+    "justfile" => Nullary(justfile),
+    "justfile_directory" => Nullary(justfile_directory),
+    "kebabcase" => Unary(kebabcase),
+    "lowercamelcase" => Unary(lowercamelcase),
+    "lowercase" => Unary(lowercase),
+    "os" => Nullary(os),
+    "os_family" => Nullary(os_family),
+    "parent_directory" => Unary(parent_directory),
+    "path_exists" => Unary(path_exists),
+    "quote" => Unary(quote),
+    "replace" => Ternary(replace),
+    "replace_regex" => Ternary(replace_regex),
+    "sha256" => Unary(sha256),
+    "sha256_file" => Unary(sha256_file),
+    "shoutykebabcase" => Unary(shoutykebabcase),
+    "shoutysnakecase" => Unary(shoutysnakecase),
+    "snakecase" => Unary(snakecase),
+    "titlecase" => Unary(titlecase),
+    "trim" => Unary(trim),
+    "trim_end" => Unary(trim_end),
+    "trim_end_match" => Binary(trim_end_match),
+    "trim_end_matches" => Binary(trim_end_matches),
+    "trim_start" => Unary(trim_start),
+    "trim_start_match" => Binary(trim_start_match),
+    "trim_start_matches" => Binary(trim_start_matches),
+    "uppercamelcase" => Unary(uppercamelcase),
+    "uppercase" => Unary(uppercase),
+    "uuid" => Nullary(uuid),
+    "without_extension" => Unary(without_extension),
+    _ => return None,
+  };
+  Some(function)
 }
 
 impl Function {
@@ -117,7 +118,7 @@ fn env_var(context: &FunctionContext, key: &str) -> Result<String, String> {
   }
 
   match env::var(key) {
-    Err(NotPresent) => Err(format!("environment variable `{}` not present", key)),
+    Err(NotPresent) => Err(format!("environment variable `{key}` not present")),
     Err(NotUnicode(os_string)) => Err(format!(
       "environment variable `{}` not unicode: {:?}",
       key, os_string
@@ -155,21 +156,21 @@ fn extension(_context: &FunctionContext, path: &str) -> Result<String, String> {
   Utf8Path::new(path)
     .extension()
     .map(str::to_owned)
-    .ok_or_else(|| format!("Could not extract extension from `{}`", path))
+    .ok_or_else(|| format!("Could not extract extension from `{path}`"))
 }
 
 fn file_name(_context: &FunctionContext, path: &str) -> Result<String, String> {
   Utf8Path::new(path)
     .file_name()
     .map(str::to_owned)
-    .ok_or_else(|| format!("Could not extract file name from `{}`", path))
+    .ok_or_else(|| format!("Could not extract file name from `{path}`"))
 }
 
 fn file_stem(_context: &FunctionContext, path: &str) -> Result<String, String> {
   Utf8Path::new(path)
     .file_stem()
     .map(str::to_owned)
-    .ok_or_else(|| format!("Could not extract file stem from `{}`", path))
+    .ok_or_else(|| format!("Could not extract file stem from `{path}`"))
 }
 
 fn invocation_directory(context: &FunctionContext) -> Result<String, String> {
@@ -177,7 +178,7 @@ fn invocation_directory(context: &FunctionContext) -> Result<String, String> {
     &context.search.working_directory,
     context.invocation_directory,
   )
-  .map_err(|e| format!("Error getting shell path: {}", e))
+  .map_err(|e| format!("Error getting shell path: {e}"))
 }
 
 fn join(
@@ -195,7 +196,7 @@ fn join(
 
 fn just_executable(_context: &FunctionContext) -> Result<String, String> {
   let exe_path =
-    std::env::current_exe().map_err(|e| format!("Error getting current executable: {}", e))?;
+    std::env::current_exe().map_err(|e| format!("Error getting current executable: {e}"))?;
 
   exe_path.to_str().map(str::to_owned).ok_or_else(|| {
     format!(
@@ -262,7 +263,7 @@ fn parent_directory(_context: &FunctionContext, path: &str) -> Result<String, St
   Utf8Path::new(path)
     .parent()
     .map(Utf8Path::to_string)
-    .ok_or_else(|| format!("Could not extract parent directory from `{}`", path))
+    .ok_or_else(|| format!("Could not extract parent directory from `{path}`"))
 }
 
 fn path_exists(context: &FunctionContext, path: &str) -> Result<String, String> {
@@ -303,7 +304,7 @@ fn sha256(_context: &FunctionContext, s: &str) -> Result<String, String> {
   let mut hasher = Sha256::new();
   hasher.update(s);
   let hash = hasher.finalize();
-  Ok(format!("{:x}", hash))
+  Ok(format!("{hash:x}"))
 }
 
 fn sha256_file(context: &FunctionContext, path: &str) -> Result<String, String> {
@@ -311,11 +312,11 @@ fn sha256_file(context: &FunctionContext, path: &str) -> Result<String, String>
   let justpath = context.search.working_directory.join(path);
   let mut hasher = Sha256::new();
   let mut file = std::fs::File::open(&justpath)
-    .map_err(|err| format!("Failed to open file at `{:?}`: {}", &justpath.to_str(), err))?;
+    .map_err(|err| format!("Failed to open file at `{:?}`: {err}", &justpath.to_str()))?;
   std::io::copy(&mut file, &mut hasher)
-    .map_err(|err| format!("Failed to read file at `{:?}`: {}", &justpath.to_str(), err))?;
+    .map_err(|err| format!("Failed to read file at `{:?}`: {err}", &justpath.to_str()))?;
   let hash = hasher.finalize();
-  Ok(format!("{:x}", hash))
+  Ok(format!("{hash:x}"))
 }
 
 fn shoutykebabcase(_context: &FunctionContext, s: &str) -> Result<String, String> {
@@ -377,11 +378,11 @@ fn uuid(_context: &FunctionContext) -> Result<String, String> {
 fn without_extension(_context: &FunctionContext, path: &str) -> Result<String, String> {
   let parent = Utf8Path::new(path)
     .parent()
-    .ok_or_else(|| format!("Could not extract parent from `{}`", path))?;
+    .ok_or_else(|| format!("Could not extract parent from `{path}`"))?;
 
   let file_stem = Utf8Path::new(path)
     .file_stem()
-    .ok_or_else(|| format!("Could not extract file stem from `{}`", path))?;
+    .ok_or_else(|| format!("Could not extract file stem from `{path}`"))?;
 
   Ok(parent.join(file_stem).to_string())
 }
diff --git a/src/interrupt_handler.rs b/src/interrupt_handler.rs
index 55f3e3a..40e31be 100644
--- a/src/interrupt_handler.rs
+++ b/src/interrupt_handler.rs
@@ -14,9 +14,7 @@ impl InterruptHandler {
   }
 
   pub(crate) fn instance() -> MutexGuard<'static, Self> {
-    lazy_static! {
-      static ref INSTANCE: Mutex<InterruptHandler> = Mutex::new(InterruptHandler::new());
-    }
+    static INSTANCE: Mutex<InterruptHandler> = Mutex::new(InterruptHandler::new());
 
     match INSTANCE.lock() {
       Ok(guard) => guard,
@@ -24,7 +22,7 @@ impl InterruptHandler {
         eprintln!(
           "{}",
           Error::Internal {
-            message: format!("interrupt handler mutex poisoned: {}", poison_error),
+            message: format!("interrupt handler mutex poisoned: {poison_error}"),
           }
           .color_display(Color::auto().stderr())
         );
@@ -33,7 +31,7 @@ impl InterruptHandler {
     }
   }
 
-  fn new() -> Self {
+  const fn new() -> Self {
     Self {
       blocks: 0,
       interrupted: false,
diff --git a/src/item.rs b/src/item.rs
index 7bc8cf1..4fdbddf 100644
--- a/src/item.rs
+++ b/src/item.rs
@@ -13,11 +13,11 @@ pub(crate) enum Item<'src> {
 impl<'src> Display for Item<'src> {
   fn fmt(&self, f: &mut Formatter) -> fmt::Result {
     match self {
-      Item::Alias(alias) => write!(f, "{}", alias),
-      Item::Assignment(assignment) => write!(f, "{}", assignment),
-      Item::Comment(comment) => write!(f, "{}", comment),
+      Item::Alias(alias) => write!(f, "{alias}"),
+      Item::Assignment(assignment) => write!(f, "{assignment}"),
+      Item::Comment(comment) => write!(f, "{comment}"),
       Item::Recipe(recipe) => write!(f, "{}", recipe.color_display(Color::never())),
-      Item::Set(set) => write!(f, "{}", set),
+      Item::Set(set) => write!(f, "{set}"),
     }
   }
 }
diff --git a/src/justfile.rs b/src/justfile.rs
index 6dd5fd2..371cea2 100644
--- a/src/justfile.rs
+++ b/src/justfile.rs
@@ -161,7 +161,7 @@ impl<'src> Justfile<'src> {
       Subcommand::Evaluate { variable, .. } => {
         if let Some(variable) = variable {
           if let Some(value) = scope.value(variable) {
-            print!("{}", value);
+            print!("{value}");
           } else {
             return Err(Error::EvalUnknownVariable {
               suggestion: self.suggest_variable(variable),
@@ -373,14 +373,14 @@ impl<'src> ColorDisplay for Justfile<'src> {
       if assignment.export {
         write!(f, "export ")?;
       }
-      write!(f, "{} := {}", name, assignment.value)?;
+      write!(f, "{name} := {}", assignment.value)?;
       items -= 1;
       if items != 0 {
         write!(f, "\n\n")?;
       }
     }
     for alias in self.aliases.values() {
-      write!(f, "{}", alias)?;
+      write!(f, "{alias}")?;
       items -= 1;
       if items != 0 {
         write!(f, "\n\n")?;
diff --git a/src/lexer.rs b/src/lexer.rs
index 06268eb..15cfb85 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -121,7 +121,7 @@ impl<'src> Lexer<'src> {
 
   fn presume(&mut self, c: char) -> CompileResult<'src, ()> {
     if !self.next_is(c) {
-      return Err(self.internal_error(format!("Lexer presumed character `{}`", c)));
+      return Err(self.internal_error(format!("Lexer presumed character `{c}`")));
     }
 
     self.advance()?;
@@ -948,7 +948,7 @@ mod tests {
 
       // Variable lexemes
       Text | StringToken | Backtick | Identifier | Comment | Unspecified => {
-        panic!("Token {:?} has no default lexeme", kind)
+        panic!("Token {kind:?} has no default lexeme")
       }
     }
   }
diff --git a/src/lib.rs b/src/lib.rs
index b4b2835..2b44126 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -88,9 +88,6 @@ pub(crate) type ConfigResult<T> = Result<T, ConfigError>;
 pub(crate) type RunResult<'a, T> = Result<T, Error<'a>>;
 pub(crate) type SearchResult<T> = Result<T, SearchError>;
 
-#[macro_use]
-extern crate lazy_static;
-
 #[cfg(test)]
 #[macro_use]
 pub mod testing;
diff --git a/src/list.rs b/src/list.rs
index f96167d..2974b00 100644
--- a/src/list.rs
+++ b/src/list.rs
@@ -41,7 +41,7 @@ impl<T: Display, I: Iterator<Item = T> + Clone> Display for List<T, I> {
     let mut values = self.values.clone().fuse();
 
     if let Some(first) = values.next() {
-      write!(f, "{}", first)?;
+      write!(f, "{first}")?;
     } else {
       return Ok(());
     }
@@ -55,7 +55,7 @@ impl<T: Display, I: Iterator<Item = T> + Clone> Display for List<T, I> {
     let third = values.next();
 
     if let (Some(second), None) = (second.as_ref(), third.as_ref()) {
-      write!(f, " {} {}", self.conjunction, second)?;
+      write!(f, " {} {second}", self.conjunction)?;
       return Ok(());
     }
 
@@ -65,12 +65,12 @@ impl<T: Display, I: Iterator<Item = T> + Clone> Display for List<T, I> {
     loop {
       match (current, next) {
         (Some(c), Some(n)) => {
-          write!(f, ", {}", c)?;
+          write!(f, ", {c}")?;
           current = Some(n);
           next = values.next();
         }
         (Some(c), None) => {
-          write!(f, ", {} {}", self.conjunction, c)?;
+          write!(f, ", {} {c}", self.conjunction)?;
           return Ok(());
         }
         _ => unreachable!("Iterator was fused, but returned Some after None"),
diff --git a/src/load_dotenv.rs b/src/load_dotenv.rs
index 7604bc7..b1fbe86 100644
--- a/src/load_dotenv.rs
+++ b/src/load_dotenv.rs
@@ -25,7 +25,7 @@ pub(crate) fn load_dotenv(
     .to_owned();
 
   for directory in working_directory.ancestors() {
-    let path = directory.join(&filename);
+    let path = directory.join(filename.as_str());
     if path.is_file() {
       return load_from_file(&path);
     }
diff --git a/src/output_error.rs b/src/output_error.rs
index 00d80af..1b92ed4 100644
--- a/src/output_error.rs
+++ b/src/output_error.rs
@@ -17,11 +17,11 @@ pub(crate) enum OutputError {
 impl Display for OutputError {
   fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
     match *self {
-      Self::Code(code) => write!(f, "Process exited with status code {}", code),
-      Self::Io(ref io_error) => write!(f, "Error executing process: {}", io_error),
-      Self::Signal(signal) => write!(f, "Process terminated by signal {}", signal),
+      Self::Code(code) => write!(f, "Process exited with status code {code}"),
+      Self::Io(ref io_error) => write!(f, "Error executing process: {io_error}"),
+      Self::Signal(signal) => write!(f, "Process terminated by signal {signal}"),
       Self::Unknown => write!(f, "Process experienced an unknown failure"),
-      Self::Utf8(ref err) => write!(f, "Could not convert process stdout to UTF-8: {}", err),
+      Self::Utf8(ref err) => write!(f, "Could not convert process stdout to UTF-8: {err}"),
     }
   }
 }
diff --git a/src/parser.rs b/src/parser.rs
index f7c7e2f..50082ba 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -894,10 +894,10 @@ mod tests {
     let justfile = Parser::parse(&tokens).expect("parsing failed");
     let have = justfile.tree();
     if have != want {
-      println!("parsed text: {}", unindented);
-      println!("expected:    {}", want);
-      println!("but got:     {}", have);
-      println!("tokens:      {:?}", tokens);
+      println!("parsed text: {unindented}");
+      println!("expected:    {want}");
+      println!("but got:     {have}");
+      println!("tokens:      {tokens:?}");
       panic!();
     }
   }
diff --git a/src/recipe.rs b/src/recipe.rs
index fa0aedb..40d1fe7 100644
--- a/src/recipe.rs
+++ b/src/recipe.rs
@@ -257,7 +257,7 @@ impl<'src, D> Recipe<'src, D> {
 
     if config.verbosity.loud() && (config.dry_run || self.quiet) {
       for line in &evaluated_lines {
-        eprintln!("{}", line);
+        eprintln!("{line}");
       }
     }
 
@@ -270,7 +270,7 @@ impl<'src, D> Recipe<'src, D> {
     })?;
 
     let shebang = Shebang::new(shebang_line).ok_or_else(|| Error::Internal {
-      message: format!("bad shebang line: {}", shebang_line),
+      message: format!("bad shebang line: {shebang_line}"),
     })?;
 
     let mut tempdir_builder = tempfile::Builder::new();
@@ -378,7 +378,7 @@ impl<'src, D> Recipe<'src, D> {
 impl<'src, D: Display> ColorDisplay for Recipe<'src, D> {
   fn fmt(&self, f: &mut Formatter, color: Color) -> Result<(), fmt::Error> {
     if let Some(doc) = self.doc {
-      writeln!(f, "# {}", doc)?;
+      writeln!(f, "# {doc}")?;
     }
 
     for attribute in &self.attributes {
@@ -401,7 +401,7 @@ impl<'src, D: Display> ColorDisplay for Recipe<'src, D> {
         write!(f, " &&")?;
       }
 
-      write!(f, " {}", dependency)?;
+      write!(f, " {dependency}")?;
     }
 
     for (i, line) in self.body.iter().enumerate() {
@@ -414,7 +414,7 @@ impl<'src, D: Display> ColorDisplay for Recipe<'src, D> {
         }
         match fragment {
           Fragment::Text { token } => write!(f, "{}", token.lexeme())?,
-          Fragment::Interpolation { expression, .. } => write!(f, "{{{{ {} }}}}", expression)?,
+          Fragment::Interpolation { expression, .. } => write!(f, "{{{{ {expression} }}}}")?,
         }
       }
       if i + 1 < self.body.len() {
diff --git a/src/search.rs b/src/search.rs
index 06cf1dd..27f99a2 100644
--- a/src/search.rs
+++ b/src/search.rs
@@ -238,7 +238,7 @@ mod tests {
     fs::write(&path, "default:\n\techo ok").unwrap();
     path.pop();
     if let Err(err) = Search::justfile(path.as_path()) {
-      panic!("No errors were expected: {}", err);
+      panic!("No errors were expected: {err}");
     }
   }
 
@@ -261,7 +261,7 @@ mod tests {
     fs::write(&path, "default:\n\techo ok").unwrap();
     path.pop();
     if let Err(err) = Search::justfile(path.as_path()) {
-      panic!("No errors were expected: {}", err);
+      panic!("No errors were expected: {err}");
     }
   }
 
@@ -277,7 +277,7 @@ mod tests {
     path.push("b");
     fs::create_dir(&path).expect("test justfile search: failed to create intermediary directory");
     if let Err(err) = Search::justfile(path.as_path()) {
-      panic!("No errors were expected: {}", err);
+      panic!("No errors were expected: {err}");
     }
   }
 
@@ -301,7 +301,7 @@ mod tests {
         path.push(DEFAULT_JUSTFILE_NAME);
         assert_eq!(found_path, path);
       }
-      Err(err) => panic!("No errors were expected: {}", err),
+      Err(err) => panic!("No errors were expected: {err}"),
     }
   }
 
@@ -317,7 +317,7 @@ mod tests {
     let justfile = sub.join("justfile");
 
     #[cfg(unix)]
-    std::os::unix::fs::symlink(&src, &justfile).unwrap();
+    std::os::unix::fs::symlink(src, &justfile).unwrap();
 
     #[cfg(windows)]
     std::os::windows::fs::symlink_file(&src, &justfile).unwrap();
@@ -335,7 +335,9 @@ mod tests {
     let cases = &[
       ("/", "foo", "/foo"),
       ("/bar", "/foo", "/foo"),
-      ("//foo", "bar//baz", "/foo/bar/baz"),
+      #[cfg(windows)]
+      ("//foo", "bar//baz", "//foo\\bar\\baz"),
+      #[cfg(not(windows))]
       ("/", "..", "/"),
       ("/", "/..", "/"),
       ("/..", "", "/"),
diff --git a/src/setting.rs b/src/setting.rs
index ab17e6f..7278760 100644
--- a/src/setting.rs
+++ b/src/setting.rs
@@ -23,10 +23,10 @@ impl<'src> Display for Setting<'src> {
       | Setting::Fallback(value)
       | Setting::IgnoreComments(value)
       | Setting::PositionalArguments(value)
-      | Setting::WindowsPowerShell(value) => write!(f, "{}", value),
-      Setting::Shell(shell) | Setting::WindowsShell(shell) => write!(f, "{}", shell),
+      | Setting::WindowsPowerShell(value) => write!(f, "{value}"),
+      Setting::Shell(shell) | Setting::WindowsShell(shell) => write!(f, "{shell}"),
       Setting::Tempdir(tempdir) => {
-        write!(f, "{:?}", tempdir)
+        write!(f, "{tempdir:?}")
       }
     }
   }
diff --git a/src/shebang.rs b/src/shebang.rs
index 3515197..0137bbc 100644
--- a/src/shebang.rs
+++ b/src/shebang.rs
@@ -40,8 +40,8 @@ impl<'line> Shebang<'line> {
 
   pub(crate) fn script_filename(&self, recipe: &str) -> String {
     match self.interpreter_filename() {
-      "cmd" | "cmd.exe" => format!("{}.bat", recipe),
-      "powershell" | "powershell.exe" | "pwsh" | "pwsh.exe" => format!("{}.ps1", recipe),
+      "cmd" | "cmd.exe" => format!("{recipe}.bat"),
+      "powershell" | "powershell.exe" | "pwsh" | "pwsh.exe" => format!("{recipe}.ps1"),
       _ => recipe.to_owned(),
     }
   }
diff --git a/src/shell.rs b/src/shell.rs
index eebdfaa..e6430f6 100644
--- a/src/shell.rs
+++ b/src/shell.rs
@@ -11,7 +11,7 @@ impl<'src> Display for Shell<'src> {
     write!(f, "[{}", self.command)?;
 
     for argument in &self.arguments {
-      write!(f, ", {}", argument)?;
+      write!(f, ", {argument}")?;
     }
 
     write!(f, "]")
diff --git a/src/show_whitespace.rs b/src/show_whitespace.rs
index 65c6902..2c618d6 100644
--- a/src/show_whitespace.rs
+++ b/src/show_whitespace.rs
@@ -9,7 +9,7 @@ impl<'str> Display for ShowWhitespace<'str> {
       match c {
         '\t' => write!(f, "␉")?,
         ' ' => write!(f, "␠")?,
-        _ => write!(f, "{}", c)?,
+        _ => write!(f, "{c}")?,
       };
     }
 
diff --git a/src/subcommand.rs b/src/subcommand.rs
index ef99058..449f100 100644
--- a/src/subcommand.rs
+++ b/src/subcommand.rs
@@ -338,7 +338,7 @@ impl Subcommand {
           .map_err(|serde_json_error| Error::DumpJson { serde_json_error })?;
         println!();
       }
-      DumpFormat::Just => print!("{}", ast),
+      DumpFormat::Just => print!("{ast}"),
     }
     Ok(())
   }
@@ -388,7 +388,7 @@ impl Subcommand {
               ChangeTag::Insert => ("+", config.color.stderr().diff_added()),
             };
 
-            eprint!("{}{}{}{}", color.prefix(), symbol, change, color.suffix());
+            eprint!("{}{symbol}{change}{}", color.prefix(), color.suffix());
           }
         }
 
@@ -478,7 +478,7 @@ impl Subcommand {
         .chain(recipe_aliases.get(name).unwrap_or(&Vec::new()))
         .enumerate()
       {
-        print!("{}{}", config.list_prefix, name);
+        print!("{}{name}", config.list_prefix);
         for parameter in &recipe.parameters {
           print!(" {}", parameter.color_display(config.color.stdout()));
         }
@@ -513,7 +513,7 @@ impl Subcommand {
   fn show<'src>(config: &Config, name: &str, justfile: Justfile<'src>) -> Result<(), Error<'src>> {
     if let Some(alias) = justfile.get_alias(name) {
       let recipe = justfile.get_recipe(alias.target.name.lexeme()).unwrap();
-      println!("{}", alias);
+      println!("{alias}");
       println!("{}", recipe.color_display(config.color.stdout()));
       Ok(())
     } else if let Some(recipe) = justfile.get_recipe(name) {
@@ -539,7 +539,7 @@ impl Subcommand {
         .map(|recipe| recipe.name())
         .collect::<Vec<&str>>()
         .join(" ");
-      println!("{}", summary);
+      println!("{summary}");
     }
   }
 
diff --git a/src/suggestion.rs b/src/suggestion.rs
index 7db586a..8bc3717 100644
--- a/src/suggestion.rs
+++ b/src/suggestion.rs
@@ -10,7 +10,7 @@ impl<'src> Display for Suggestion<'src> {
   fn fmt(&self, f: &mut Formatter) -> fmt::Result {
     write!(f, "Did you mean `{}`", self.name)?;
     if let Some(target) = self.target {
-      write!(f, ", an alias for `{}`", target)?;
+      write!(f, ", an alias for `{target}`")?;
     }
     write!(f, "?")
   }
diff --git a/src/testing.rs b/src/testing.rs
index 5988e48..8de5e2f 100644
--- a/src/testing.rs
+++ b/src/testing.rs
@@ -6,7 +6,7 @@ use pretty_assertions::assert_eq;
 pub(crate) fn compile(text: &str) -> Justfile {
   match Compiler::compile(text) {
     Ok(justfile) => justfile,
-    Err(error) => panic!("Expected successful compilation but got error:\n {}", error),
+    Err(error) => panic!("Expected successful compilation but got error:\n {error}"),
   }
 }
 
diff --git a/src/thunk.rs b/src/thunk.rs
index 14206f8..74112db 100644
--- a/src/thunk.rs
+++ b/src/thunk.rs
@@ -49,17 +49,14 @@ impl<'src> Thunk<'src> {
     name: Name<'src>,
     mut arguments: Vec<Expression<'src>>,
   ) -> CompileResult<'src, Thunk<'src>> {
-    crate::function::TABLE.get(&name.lexeme()).map_or(
+    crate::function::get(name.lexeme()).map_or(
       Err(name.error(CompileErrorKind::UnknownFunction {
         function: name.lexeme(),
       })),
       |function| match (function, arguments.len()) {
-        (Function::Nullary(function), 0) => Ok(Thunk::Nullary {
-          function: *function,
-          name,
-        }),
+        (Function::Nullary(function), 0) => Ok(Thunk::Nullary { function, name }),
         (Function::Unary(function), 1) => Ok(Thunk::Unary {
-          function: *function,
+          function,
           arg: Box::new(arguments.pop().unwrap()),
           name,
         }),
@@ -67,7 +64,7 @@ impl<'src> Thunk<'src> {
           let b = Box::new(arguments.pop().unwrap());
           let a = Box::new(arguments.pop().unwrap());
           Ok(Thunk::Binary {
-            function: *function,
+            function,
             args: [a, b],
             name,
           })
@@ -77,7 +74,7 @@ impl<'src> Thunk<'src> {
           let b = Box::new(arguments.pop().unwrap());
           let a = Box::new(arguments.pop().unwrap());
           Ok(Thunk::BinaryPlus {
-            function: *function,
+            function,
             args: ([a, b], rest),
             name,
           })
@@ -87,12 +84,12 @@ impl<'src> Thunk<'src> {
           let b = Box::new(arguments.pop().unwrap());
           let a = Box::new(arguments.pop().unwrap());
           Ok(Thunk::Ternary {
-            function: *function,
+            function,
             args: [a, b, c],
             name,
           })
         }
-        _ => Err(name.error(CompileErrorKind::FunctionArgumentCountMismatch {
+        (function, _) => Err(name.error(CompileErrorKind::FunctionArgumentCountMismatch {
           function: name.lexeme(),
           found: arguments.len(),
           expected: function.argc(),
@@ -107,18 +104,18 @@ impl Display for Thunk<'_> {
     use Thunk::*;
     match self {
       Nullary { name, .. } => write!(f, "{}()", name.lexeme()),
-      Unary { name, arg, .. } => write!(f, "{}({})", name.lexeme(), arg),
+      Unary { name, arg, .. } => write!(f, "{}({arg})", name.lexeme()),
       Binary {
         name, args: [a, b], ..
-      } => write!(f, "{}({}, {})", name.lexeme(), a, b),
+      } => write!(f, "{}({a}, {b})", name.lexeme()),
       BinaryPlus {
         name,
         args: ([a, b], rest),
         ..
       } => {
-        write!(f, "{}({}, {}", name.lexeme(), a, b)?;
+        write!(f, "{}({a}, {b}", name.lexeme())?;
         for arg in rest {
-          write!(f, ", {}", arg)?;
+          write!(f, ", {arg}")?;
         }
         write!(f, ")")
       }
@@ -126,7 +123,7 @@ impl Display for Thunk<'_> {
         name,
         args: [a, b, c],
         ..
-      } => write!(f, "{}({}, {}, {})", name.lexeme(), a, b, c),
+      } => write!(f, "{}({a}, {b}, {c})", name.lexeme()),
     }
   }
 }
diff --git a/src/token.rs b/src/token.rs
index c360f32..af4f818 100644
--- a/src/token.rs
+++ b/src/token.rs
@@ -53,7 +53,7 @@ impl<'src> ColorDisplay for Token<'src> {
         }
         let line_number_width = line_number.to_string().len();
         writeln!(f, "{0:1$} |", "", line_number_width)?;
-        writeln!(f, "{} | {}", line_number, space_line)?;
+        writeln!(f, "{line_number} | {space_line}")?;
         write!(f, "{0:1$} |", "", line_number_width)?;
         write!(
           f,
diff --git a/src/tree.rs b/src/tree.rs
index d72d0f9..8914562 100644
--- a/src/tree.rs
+++ b/src/tree.rs
@@ -133,12 +133,12 @@ impl Display for Tree<'_> {
           if i > 0 {
             write!(f, " ")?;
           }
-          write!(f, "{}", child)?;
+          write!(f, "{child}")?;
         }
 
         write!(f, ")")
       }
-      Tree::Atom(text) => write!(f, "{}", text),
+      Tree::Atom(text) => write!(f, "{text}"),
     }
   }
 }
diff --git a/src/unresolved_dependency.rs b/src/unresolved_dependency.rs
index cbe880e..97f69d6 100644
--- a/src/unresolved_dependency.rs
+++ b/src/unresolved_dependency.rs
@@ -14,7 +14,7 @@ impl<'src> Display for UnresolvedDependency<'src> {
       write!(f, "({}", self.recipe)?;
 
       for argument in &self.arguments {
-        write!(f, " {}", argument)?;
+        write!(f, " {argument}")?;
       }
 
       write!(f, ")")
diff --git a/src/verbosity.rs b/src/verbosity.rs
index b7acdc2..562ae9d 100644
--- a/src/verbosity.rs
+++ b/src/verbosity.rs
@@ -38,10 +38,8 @@ impl Verbosity {
       Grandiloquent => true,
     }
   }
-}
 
-impl Default for Verbosity {
-  fn default() -> Self {
+  pub const fn default() -> Self {
     Self::Taciturn
   }
 }
diff --git a/tests/command.rs b/tests/command.rs
index abf18c3..6080e66 100644
--- a/tests/command.rs
+++ b/tests/command.rs
@@ -105,7 +105,7 @@ fn working_directory_is_correct() {
   fs::write(tmp.path().join("bar"), "baz").unwrap();
   fs::create_dir(tmp.path().join("foo")).unwrap();
 
-  let output = Command::new(&executable_path("just"))
+  let output = Command::new(executable_path("just"))
     .args(["--command", "cat", "bar"])
     .current_dir(tmp.path().join("foo"))
     .output()
@@ -124,7 +124,7 @@ fn command_not_found() {
 
   fs::write(tmp.path().join("justfile"), "").unwrap();
 
-  let output = Command::new(&executable_path("just"))
+  let output = Command::new(executable_path("just"))
     .args(["--command", "asdfasdfasdfasdfadfsadsfadsf", "bar"])
     .output()
     .unwrap();
diff --git a/tests/edit.rs b/tests/edit.rs
index c7d72c7..aa26d2d 100644
--- a/tests/edit.rs
+++ b/tests/edit.rs
@@ -49,7 +49,7 @@ fn invoke_error() {
   assert_eq!(
     String::from_utf8_lossy(&output.stderr),
     if cfg!(windows) {
-      "error: Editor `/` invocation failed: Access is denied. (os error 5)\n"
+      "error: Editor `/` invocation failed: program path has no file name\n"
     } else {
       "error: Editor `/` invocation failed: Permission denied (os error 13)\n"
     }
diff --git a/tests/init.rs b/tests/init.rs
index 955f51d..7ef2766 100644
--- a/tests/init.rs
+++ b/tests/init.rs
@@ -42,7 +42,7 @@ fn write_error() {
 
   let justfile_path = test.justfile_path();
 
-  fs::create_dir(&justfile_path).unwrap();
+  fs::create_dir(justfile_path).unwrap();
 
   test
     .no_justfile()
diff --git a/tests/interrupts.rs b/tests/interrupts.rs
index 44b2d71..25e5c0b 100644
--- a/tests/interrupts.rs
+++ b/tests/interrupts.rs
@@ -16,8 +16,8 @@ fn interrupt_test(arguments: &[&str], justfile: &str) {
 
   let start = Instant::now();
 
-  let mut child = Command::new(&executable_path("just"))
-    .current_dir(&tmp)
+  let mut child = Command::new(executable_path("just"))
+    .current_dir(tmp)
     .args(arguments)
     .spawn()
     .expect("just invocation failed");
diff --git a/tests/invocation_directory.rs b/tests/invocation_directory.rs
index 00cda35..9dbacaa 100644
--- a/tests/invocation_directory.rs
+++ b/tests/invocation_directory.rs
@@ -48,7 +48,7 @@ fn test_invocation_directory() {
   subdir.push("subdir");
   fs::create_dir(&subdir).unwrap();
 
-  let output = Command::new(&executable_path("just"))
+  let output = Command::new(executable_path("just"))
     .current_dir(&subdir)
     .args(["--shell", "sh"])
     .output()
diff --git a/tests/readme.rs b/tests/readme.rs
index 2149e94..566bedc 100644
--- a/tests/readme.rs
+++ b/tests/readme.rs
@@ -25,7 +25,7 @@ fn readme() {
 
     let path = tmp.path().join("justfile");
 
-    fs::write(&path, &justfile).unwrap();
+    fs::write(path, justfile).unwrap();
 
     let output = Command::new(executable_path("just"))
       .current_dir(tmp.path())
diff --git a/tests/search.rs b/tests/search.rs
index c52a5cf..67fa7f2 100644
--- a/tests/search.rs
+++ b/tests/search.rs
@@ -59,8 +59,8 @@ fn test_upwards_path_argument() {
     },
   };
 
-  search_test(&tmp.path().join("a"), &["../"]);
-  search_test(&tmp.path().join("a"), &["../default"]);
+  search_test(tmp.path().join("a"), &["../"]);
+  search_test(tmp.path().join("a"), &["../default"]);
 }
 
 #[test]
@@ -140,7 +140,7 @@ fn single_upwards() {
 
   let path = tmp.path().join("child");
 
-  search_test(&path, &["../"]);
+  search_test(path, &["../"]);
 }
 
 #[test]
diff --git a/tests/test.rs b/tests/test.rs
index 00f7bad..6c25362 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -176,7 +176,7 @@ impl Test {
     dotenv_path.push(".env");
     fs::write(dotenv_path, "DOTENV_KEY=dotenv-value").unwrap();
 
-    let mut command = Command::new(&executable_path("just"));
+    let mut command = Command::new(executable_path("just"));
 
     if self.shell {
       command.args(["--shell", "bash"]);
@@ -258,7 +258,7 @@ struct Output<'a> {
 fn test_round_trip(tmpdir: &Path) {
   println!("Reparsing...");
 
-  let output = Command::new(&executable_path("just"))
+  let output = Command::new(executable_path("just"))
     .current_dir(tmpdir)
     .arg("--dump")
     .output()
@@ -274,7 +274,7 @@ fn test_round_trip(tmpdir: &Path) {
 
   fs::write(&reparsed_path, &dumped).unwrap();
 
-  let output = Command::new(&executable_path("just"))
+  let output = Command::new(executable_path("just"))
     .current_dir(tmpdir)
     .arg("--justfile")
     .arg(&reparsed_path)