diff --git a/src/atrule.rs b/src/atrule.rs
index 04a38de..d75e6a9 100644
--- a/src/atrule.rs
+++ b/src/atrule.rs
@@ -89,14 +89,15 @@ impl AtRule {
                     t.push(toks.next().unwrap());
                 }
                 AtRule::Return(t)
-            },
+            }
             AtRuleKind::Use => todo!("@use not yet implemented"),
             AtRuleKind::Annotation => todo!("@annotation not yet implemented"),
             AtRuleKind::AtRoot => todo!("@at-root not yet implemented"),
             AtRuleKind::Charset => {
-                toks.take_while(|t| t.kind != TokenKind::Symbol(Symbol::SemiColon)).for_each(drop);
+                toks.take_while(|t| t.kind != TokenKind::Symbol(Symbol::SemiColon))
+                    .for_each(drop);
                 AtRule::Charset
-            },
+            }
             AtRuleKind::Each => todo!("@each not yet implemented"),
             AtRuleKind::Extend => todo!("@extend not yet implemented"),
             AtRuleKind::If => todo!("@if not yet implemented"),
diff --git a/src/css.rs b/src/css.rs
index 3b860ac..c50bf19 100644
--- a/src/css.rs
+++ b/src/css.rs
@@ -1,11 +1,11 @@
 //! # Convert from SCSS AST to CSS
 use crate::atrule::AtRule;
 use crate::error::SassResult;
-use crate::{RuleSet, Selector, Stmt, Style, StyleSheet};
 use crate::lexer::IS_UTF8;
-use std::sync::atomic::Ordering;
+use crate::{RuleSet, Selector, Stmt, Style, StyleSheet};
 use std::fmt;
 use std::io::Write;
+use std::sync::atomic::Ordering;
 
 #[derive(Debug, Clone)]
 enum Toplevel {
diff --git a/src/mixin.rs b/src/mixin.rs
index d61d663..23b6c43 100644
--- a/src/mixin.rs
+++ b/src/mixin.rs
@@ -98,11 +98,13 @@ impl Mixin {
                 Expr::Style(s) => stmts.push(Stmt::Style(*s)),
                 Expr::Styles(s) => stmts.extend(s.into_iter().map(Stmt::Style)),
                 Expr::Include(s) => stmts.extend(s),
-                Expr::FunctionDecl(..) => return Err("Mixins may not contain function declarations.".into()),
-                Expr::MixinDecl(..) => return Err("Mixins may not contain mixin declarations.".into()),
-                Expr::Debug(..) | Expr::Warn(..) => {
-                    todo!()
+                Expr::FunctionDecl(..) => {
+                    return Err("Mixins may not contain function declarations.".into())
                 }
+                Expr::MixinDecl(..) => {
+                    return Err("Mixins may not contain mixin declarations.".into())
+                }
+                Expr::Debug(..) | Expr::Warn(..) => todo!(),
                 Expr::Selector(selector) => {
                     let rules = self.eval(&super_selector.zip(&selector))?;
                     stmts.push(Stmt::RuleSet(RuleSet {
diff --git a/src/value/mod.rs b/src/value/mod.rs
index cf0bcbe..d9c5ded 100644
--- a/src/value/mod.rs
+++ b/src/value/mod.rs
@@ -52,8 +52,7 @@ impl Display for Value {
                     write!(f, "\"{}\"", val)
                 } else if !has_single_quotes && has_double_quotes {
                     write!(f, "'{}'", val)
-                }
-                else if !has_single_quotes && !has_double_quotes {
+                } else if !has_single_quotes && !has_double_quotes {
                     write!(f, "\"{}\"", val)
                 } else {
                     let quote_char = match kind {