diff --git a/.gitignore b/.gitignore
index 26038bd..05025d2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,14 +4,16 @@ Cargo.lock
 
 *.swp
 
+# IDE configs
+.idea/
+.vscode/
+
 # Potential products from TeX while testing
 *.pdf
 *.log
 *.aux
 *.iml
 
-.vscode
-
 # Product of `qc` binary
 test.svg
 
diff --git a/fonts/stix2/src/style.rs b/fonts/stix2/src/style.rs
index bba7e23..12364de 100644
--- a/fonts/stix2/src/style.rs
+++ b/fonts/stix2/src/style.rs
@@ -77,11 +77,11 @@ static DIGIT_LUT: [u32; 28] = [
 #[inline]
 pub fn style_symbol(codepoint: u32, style: Style) -> u32 {
     match codepoint {
-        LOWER_A...LOWER_Z => style_lookup(&LATIN_LOWER_LUT, codepoint, style),
-        UPPER_A...UPPER_Z => style_lookup(&LATIN_UPPER_LUT, codepoint, style),
-        UPPER_ALPHA...UPPER_OMEGA => style_lookup(&GREEK_UPPER_LUT, codepoint, style),
-        LOWER_ALPHA...LOWER_OMEGA => style_lookup(&GREEK_LOWER_LUT, codepoint, style),
-        DIGIT_0...DIGIT_9 => style_lookup(&DIGIT_LUT, codepoint, style),
+        LOWER_A..=LOWER_Z => style_lookup(&LATIN_LOWER_LUT, codepoint, style),
+        UPPER_A..=UPPER_Z => style_lookup(&LATIN_UPPER_LUT, codepoint, style),
+        UPPER_ALPHA..=UPPER_OMEGA => style_lookup(&GREEK_UPPER_LUT, codepoint, style),
+        LOWER_ALPHA..=LOWER_OMEGA => style_lookup(&GREEK_LOWER_LUT, codepoint, style),
+        DIGIT_0..=DIGIT_9 => style_lookup(&DIGIT_LUT, codepoint, style),
         _ => style_other(codepoint, style),
     }
 }
diff --git a/src/layout/mod.rs b/src/layout/mod.rs
index 05ee0b0..050f0ae 100644
--- a/src/layout/mod.rs
+++ b/src/layout/mod.rs
@@ -308,7 +308,6 @@ impl Style {
     }
 
     fn font_scale(self) -> FontUnit {
-        use font::constants;
         match self {
             Style::Display | Style::DisplayCramped | Style::Text | Style::TextCramped => {
                 FontUnit::from(1)
diff --git a/src/parser/engine.rs b/src/parser/engine.rs
index 805a4f2..5292c7e 100644
--- a/src/parser/engine.rs
+++ b/src/parser/engine.rs
@@ -176,7 +176,7 @@ pub fn command(lex: &mut Lexer, local: Style) -> Result<Option<ParseNode>> {
     }
 }
 
-/// Parse an implicit group.  For example `\left ... \right` is an implicit group.
+/// Parse an implicit group.  For example `\left ..= \right` is an implicit group.
 /// This is one point where we will deviate from TeX a little bit.  We won't
 /// characterize every command that will start a new implicit group
 /// (for instance, `\frac`).
@@ -403,7 +403,7 @@ pub fn parse(input: &str) -> Result<Vec<ParseNode>> {
 /// negatives when used for other things.
 fn codepoint_atom_type(codepoint: char) -> Option<AtomType> {
     Some(match codepoint {
-             'a'...'z' | 'A'...'Z' | '0'...'9' | 'Α'...'Ω' | 'α'...'ω' => AtomType::Alpha,
+             'a'..='z' | 'A'..='Z' | '0'..='9' | 'Α'..='Ω' | 'α'..='ω' => AtomType::Alpha,
              '*' | '+' | '-' => AtomType::Binary,
              '[' | '(' => AtomType::Open,
              ']' | ')' | '?' | '!' => AtomType::Close,
diff --git a/src/render/svg.rs b/src/render/svg.rs
index 0e6edcd..a011783 100644
--- a/src/render/svg.rs
+++ b/src/render/svg.rs
@@ -16,8 +16,6 @@ pub fn render_to_path<P: AsRef<Path>>(path: P, settings: &RenderSettings, input:
 }
 
 pub fn render_to_file(file: &mut File, settings: &RenderSettings, input: &str) {
-    use std::io::Write;
-
     let s: Vec<u8> = SVGRenderer::new(&settings)
         .render(input)
         .expect("failed to render");