I added a few own definitions and fix some bad readable colours.

Author: Virtuos86

rs.syntax

@@ -82,7 +82,7 @@ context default
     keyword whole true yellow
     keyword whole false yellow
 
-    keyword & brightmagenta
+    keyword & brightgreen
     keyword ( brightcyan
     keyword ) brightcyan
     keyword { brightcyan
@@ -92,6 +92,8 @@ context default
 
     keyword -> gray
 
+    keyword :: white
+
     keyword whole == yellow
     keyword whole != yellow
     keyword > yellow