Highlight control flow in Rust/C/C++ (#39683)

part of https://github.com/zed-industries/zed/issues/9461


Release Notes:
- Added the ability to seperately highlight control flow keywords for
Rust, C and C++ for users and theme authors via the `keyword.control`
syntax property
<img width="805" height="475" alt="スクリーンショット 2025-10-07 22 21 59"
src="https://github.com/user-attachments/assets/40ed03ea-a129-44ce-b6d8-284656b9f3ba"
/>

crates/languages/src/c/highlights.scm

@@ -1,27 +1,30 @@
+[
+  "const"
+  "enum"
+  "extern"
+  "inline"
+  "sizeof"
+  "static"
+  "struct"
+  "typedef"
+  "union"
+  "volatile"
+] @keyword
+
 [
   "break"
   "case"
-  "const"
   "continue"
   "default"
   "do"
   "else"
-  "enum"
-  "extern"
   "for"
   "goto"
   "if"
-  "inline"
   "return"
-  "sizeof"
-  "static"
-  "struct"
   "switch"
-  "typedef"
-  "union"
-  "volatile"
   "while"
-] @keyword
+] @keyword.control
 
 [
   "#define"

crates/languages/src/cpp/highlights.scm

@@ -106,32 +106,19 @@ type: (primitive_type) @type.builtin
 [
   "alignas"
   "alignof"
-  "break"
-  "case"
-  "catch"
   "class"
-  "co_await"
-  "co_return"
-  "co_yield"
   "concept"
   "consteval"
   "constexpr"
   "constinit"
-  "continue"
   "decltype"
-  "default"
   "delete"
-  "do"
-  "else"
   "enum"
   "explicit"
   "export"
   "extern"
   "final"
-  "for"
   "friend"
-  "goto"
-  "if"
   "import"
   "inline"
   "module"
@@ -144,24 +131,40 @@ type: (primitive_type) @type.builtin
   "protected"
   "public"
   "requires"
-  "return"
   "sizeof"
   "struct"
-  "switch"
   "template"
   "thread_local"
-  "throw"
-  "try"
   "typedef"
   "typename"
   "union"
   "using"
   "virtual"
-  "while"
   (storage_class_specifier)
   (type_qualifier)
 ] @keyword
 
+[
+  "break"
+  "case"
+  "catch"
+  "co_await"
+  "co_return"
+  "co_yield"
+  "continue"
+  "default"
+  "do"
+  "else"
+  "for"
+  "goto"
+  "if"
+  "return"
+  "switch"
+  "throw"
+  "try"
+  "while"
+] @keyword.control
+
 [
   "#define"
   "#elif"

crates/languages/src/rust/highlights.scm

@@ -83,29 +83,20 @@
   "as"
   "async"
   "await"
-  "break"
   "const"
-  "continue"
   "default"
   "dyn"
-  "else"
   "enum"
   "extern"
   "fn"
-  "for"
-  "if"
   "impl"
-  "in"
   "let"
-  "loop"
   "macro_rules!"
-  "match"
   "mod"
   "move"
   "pub"
   "raw"
   "ref"
-  "return"
   "static"
   "struct"
   "trait"
@@ -114,13 +105,25 @@
   "unsafe"
   "use"
   "where"
-  "while"
-  "yield"
   (crate)
   (mutable_specifier)
   (super)
 ] @keyword
 
+[
+  "break"
+  "continue"
+  "else"
+  "for"
+  "if"
+  "in"
+  "loop"
+  "match"
+  "return"
+  "while"
+  "yield"
+] @keyword.control
+
 [
   (string_literal)
   (raw_string_literal)