add missing import that happy -agc secretly provided

diff --git a/compiler/cmm/CmmParse.y b/compiler/cmm/CmmParse.y
index 7c55e19..2d74aee 100644 (file)
--- a/compiler/cmm/CmmParse.y
+++ b/compiler/cmm/CmmParse.y
@@ -54,6 +54,7 @@ import Constants
 import Outputable
 
 import Control.Monad
+import Data.Array
 import Data.Char       ( ord )
 import System.Exit