From f5d95de22784bd33b8dec0edfbfd106582427318 Mon Sep 17 00:00:00 2001
From: Michael Davis
Date: Thu, 21 Mar 2024 10:05:48 -0400
Subject: C++: Improve parameter highlighting

This adds parameter highlighting for reference parameters and defaulted
parameters. For example:

```cpp
auto strip_prefix_only(std::string& s,
                       Hidden_Homonym skip_hidden_homonym = {}) const
    -> Affixing_Result<Prefix>;
```

Previously both parameters were only highlighted as variables.
---
 runtime/queries/cpp/highlights.scm | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/runtime/queries/cpp/highlights.scm b/runtime/queries/cpp/highlights.scm
index 509dcdf7..c1d14a0b 100644
--- a/runtime/queries/cpp/highlights.scm
+++ b/runtime/queries/cpp/highlights.scm
@@ -49,6 +49,13 @@
 (this) @variable.builtin
 (nullptr) @constant.builtin
 
+; Parameters
+
+(parameter_declaration
+  declarator: (reference_declarator (identifier) @variable.parameter))
+(optional_parameter_declaration
+  declarator: (identifier) @variable.parameter)
+
 ; Keywords
 
 (template_argument_list (["<" ">"] @punctuation.bracket))
-- 
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