diff --git a/data/config.toml b/data/config.toml
index 3cbc283..64f37e8 100644
--- a/data/config.toml
+++ b/data/config.toml
@@ -67,16 +67,17 @@ exec = { fg = "#E6D29E", bg = "#Bf616A" }
 boolean = { fg = "#DCA561", bold = true }
 character = { fg = "#61DCA5", italic = true }
 comment = { fg = "#624354", italic = true }
-constant = { fg = "#FF9E3B" }
-function = { fg = "#957FB8" }
+constant = { fg = "#FFA066" }
+function = { fg = "#8793B5" }
+"function.macro" = { fg = "#FFA066" }
 keyword = { fg = "#Bf616A" }
 module = { fg = "#2D4F67" }
 number = { fg = "#D27E99" }
-operator = { fg = "#E6C384" }
+operator = { fg = "#DCA561" }
 punctuation = { fg = "#9CABCA" }
 string = { fg = "#61DCA5" }
-type = { fg = "#7E9CD8" }
-variable = { fg = "#E6C384" }
+type = { fg = "#9AB292" }
+variable = { fg = "#E6D29E" }
 
 
 # Key mappings to programs that must be available on $PATH or commands.
diff --git a/data/tree-sitter/queries/rust/highlights.scm b/data/tree-sitter/queries/rust/highlights.scm
index e1135f9..7c03474 100644
--- a/data/tree-sitter/queries/rust/highlights.scm
+++ b/data/tree-sitter/queries/rust/highlights.scm
@@ -1,11 +1,5 @@
 (shebang) @keyword.directive
 
-(function_item (identifier) @function)
-(function_signature_item (identifier) @function)
-(macro_invocation
-  macro: (identifier) @function.macro
-  "!" @function.macro)
-
 (identifier) @variable
 
 ; Assume all-caps names are constants
@@ -24,12 +18,35 @@
   name: (identifier) @module)
 (self) @keyword.builtin
 
+(function_item (identifier) @function)
+(function_signature_item (identifier) @function)
+(macro_invocation
+  macro: (identifier) @function.macro
+  "!" @function.macro)
+
+(call_expression
+  function: (identifier) @function.call)
+(call_expression
+  function: (scoped_identifier
+    (identifier) @function.call .))
+(call_expression
+  function: (field_expression
+    field: (field_identifier) @function.call))
+(generic_function
+  function: (identifier) @function.call)
+(generic_function
+  function: (scoped_identifier
+    name: (identifier) @function.call))
+(generic_function
+  function: (field_expression
+    field: (field_identifier) @function.call))
+
 [
   (line_comment)
   (block_comment)
   (outer_doc_comment_marker)
   (inner_doc_comment_marker)
-] @comment @spell
+] @comment
 
 (line_comment
   (doc_comment)) @comment.documentation
diff --git a/src/config.rs b/src/config.rs
index 940430a..8e3e01d 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -77,8 +77,20 @@ impl Config {
             Err(e) => return Err(format!("Unable to load config file: {e}")),
         };
 
-        cfg.set_default_bg_for_tokens();
-        cfg.expand_home_dir_refs(&home);
+        // Use default colorscheme's background color if none is specified
+        for style in cfg.colorscheme.syntax.values_mut() {
+            style.bg = style.bg.or(Some(cfg.colorscheme.bg));
+        }
+
+        // Replace "~/" shorthand notation in paths with the user's $HOME
+        for s in [
+            &mut cfg.tree_sitter.parser_dir,
+            &mut cfg.tree_sitter.syntax_query_dir,
+        ] {
+            if s.starts_with("~/") {
+                *s = s.replacen("~", &home, 1);
+            }
+        }
 
         Ok(cfg)
     }
@@ -103,26 +115,6 @@ impl Config {
 
         Err("runtime config updates are not currently supported".to_owned())
     }
-
-    fn set_default_bg_for_tokens(&mut self) {
-        for style in self.colorscheme.syntax.values_mut() {
-            // Use default colorscheme's background color if none is specified
-            if style.bg.is_none() {
-                style.bg = Some(self.colorscheme.bg);
-            }
-        }
-    }
-
-    fn expand_home_dir_refs(&mut self, home: &str) {
-        for s in [
-            &mut self.tree_sitter.parser_dir,
-            &mut self.tree_sitter.syntax_query_dir,
-        ] {
-            if s.starts_with("~/") {
-                *s = s.replacen("~", home, 1);
-            }
-        }
-    }
 }
 
 /// A colorscheme for rendering the UI.