queries: Update ron

runtime/queries/ron/highlights.scm

@@ -1,21 +1,19 @@
-; Literals
-;------------
-
-(string) @string
-(boolean) @constant.builtin.boolean
-(integer) @constant.numeric.integer
-(float) @constant.numeric.float
-(char) @constant.character
-
 ; Structs
 ;------------
 
 (enum_variant) @type.enum.variant
 (struct_entry (_) @variable.other.member ":")
 (struct_name (identifier)) @type
+(unit_struct) @type.builtin
 
+; Literals
+;------------
 
-
+(string) @string
+(boolean) @constant.builtin.boolean
+(integer) @constant.numeric.integer
+(float) @constant.numeric.float
+(char) @constant.character
 
 ; Comments
 ;------------
@@ -37,6 +35,7 @@
 "{" @punctuation.bracket
 "}" @punctuation.bracket
 
+"-" @operator
 
 ; Special
 ;------------