diff --git a/src/parse_styles.rs b/src/parse_styles.rs
index 4eb62180..9d3ccdba 100644
--- a/src/parse_styles.rs
+++ b/src/parse_styles.rs
@@ -28,8 +28,15 @@ pub fn parse_styles(opt: &cli::Opt) -> HashMap<String, Style> {
     make_misc_styles(opt, &mut styles);
 
     let mut resolved_styles = resolve_style_references(styles, opt);
-    resolved_styles.get_mut("minus-emph-style").unwrap().is_emph = true;
-    resolved_styles.get_mut("plus-emph-style").unwrap().is_emph = true;
+    resolved_styles
+        .get_mut("minus-emph-style")
+        .unwrap_or_else(|| panic!("minus-emph-style not found in resolved styles"))
+        .is_emph = true;
+
+    resolved_styles
+        .get_mut("plus-emph-style")
+        .unwrap_or_else(|| panic!("plus-emph-style not found in resolved styles"))
+        .is_emph = true;
     resolved_styles
 }
 
@@ -114,7 +121,7 @@ fn parse_as_reference_to_git_config(style_string: &str, opt: &cli::Opt) -> Style
     }
 }
 
-fn make_hunk_styles<'a>(opt: &'a cli::Opt, styles: &'a mut HashMap<&str, StyleReference>) {
+fn make_hunk_styles(opt: &cli::Opt, styles: &mut HashMap<&str, StyleReference>) {
     let color_mode = opt.computed.color_mode;
     let true_color = opt.computed.true_color;
     let minus_style = style_from_str(
diff --git a/src/style.rs b/src/style.rs
index c52400c8..029cc395 100644
--- a/src/style.rs
+++ b/src/style.rs
@@ -307,17 +307,11 @@ impl fmt::Debug for AnsiTermStyleEqualityKey {
 }
 
 fn ansi_term_color_equality(a: Option<ansi_term::Color>, b: Option<ansi_term::Color>) -> bool {
-    match (a, b) {
-        (None, None) => true,
-        (None, Some(_)) => false,
-        (Some(_), None) => false,
-        (Some(a), Some(b)) => {
-            if a == b {
-                true
-            } else {
-                ansi_term_16_color_equality(a, b) || ansi_term_16_color_equality(b, a)
-            }
+    match a.zip(b) {
+        Some((a, b)) => {
+            a == b || ansi_term_16_color_equality(a, b) || ansi_term_16_color_equality(b, a)
         }
+        None => a.is_none() && b.is_none(),
     }
 }