Add the 'auto' keyword.

contrib/geshi/chaiscript.php

@@ -51,7 +51,7 @@ $language_data = array (
             'break', 'else', 'else if', 'eval', 'for', 'if', 'return', 'while', 'try', 'catch', 'finally',
             ),
         2 => array(
-            'def', 'false', 'fun', 'true', 'var', 'attr',
+            'def', 'false', 'fun', 'true', 'var', 'auto', 'attr',
             ),
         3 => array(
             // built in functions

contrib/vim/syntax/chaiscript.vim

@@ -49,7 +49,7 @@ syn keyword chaiscriptExceptions   try catch throw
 syn keyword chaiscriptKeyword      def true false attr
 
 "Built in types
-syn keyword chaiscriptType         fun var
+syn keyword chaiscriptType         fun var auto
 
 "Built in funcs, keep it simple
 syn keyword chaiscriptFunc         eval throw