Fix & Tweak Rust's Syntax Highlighting (#5238)

runtime/queries/rust/highlights.scm

@@ -45,7 +45,8 @@
   "'" @label
   (identifier) @label)
 (loop_label
-  (identifier) @type)
+  "'" @label
+  (identifier) @label)
 
 ; ---
 ; Punctuation
@@ -102,8 +103,6 @@
 (closure_parameters
 	(identifier) @variable.parameter)
 
-
-
 ; -------
 ; Keywords
 ; -------
@@ -129,9 +128,7 @@
 [
   "break"
   "continue"
-
   "return"
-
   "await"
 ] @keyword.control.return
 
@@ -154,10 +151,7 @@
   "trait"
   "for"
 
-  "unsafe"
   "default"
-  "macro_rules!"
-
   "async"
 ] @keyword
 
@@ -165,13 +159,13 @@
   "struct"
   "enum"
   "union"
-
   "type"
 ] @keyword.storage.type
 
 "let" @keyword.storage
-
 "fn" @keyword.function
+"unsafe" @keyword.special
+"macro_rules!" @function.macro
 
 (mutable_specifier) @keyword.storage.modifier.mut
 
@@ -202,11 +196,11 @@
 
 (call_expression
   function: [
-    ((identifier) @type.variant
+    ((identifier) @type.enum.variant
-      (#match? @type.variant "^[A-Z]"))
+      (#match? @type.enum.variant "^[A-Z]"))
     (scoped_identifier
-      name: ((identifier) @type.variant
+      name: ((identifier) @type.enum.variant
-        (#match? @type.variant "^[A-Z]")))
+        (#match? @type.enum.variant "^[A-Z]")))
   ])
 
 ; ---
@@ -237,8 +231,6 @@
 ((identifier) @type
   (#match? @type "^[A-Z]"))
 
-
-
 (attribute
   (identifier) @_macro
   arguments: (token_tree (identifier) @constant.numeric.integer)
@@ -246,7 +238,6 @@
 )
 @special
 
-
 ; -------
 ; Functions
 ; -------
@@ -303,8 +294,6 @@
 (metavariable) @variable.parameter
 (fragment_specifier) @type
 
-
-
 ; -------
 ; Operators
 ; -------
@@ -350,8 +339,6 @@
   "'"
 ] @operator
 
-
-
 ; -------
 ; Paths
 ; -------
@@ -382,8 +369,6 @@
 (scoped_type_identifier
   path: (identifier) @namespace)
 
-
-
 ; -------
 ; Remaining Identifiers
 ; -------