--- agda-2.2.10.orig/src/full/Agda/Syntax/Parser/Lexer.x
+++ agda-2.2.10/src/full/Agda/Syntax/Parser/Lexer.x
@@ -1,5 +1,5 @@
 {
-{-# OPTIONS_GHC -fno-warn-deprecated-flags #-}
+{-# OPTIONS_GHC -fno-warn-deprecated-flags -XBangPatterns #-}
 {-| The lexer is generated by Alex (<http://www.haskell.org/alex>) and is an
     adaptation of GHC's lexer. The main lexing function 'lexer' is called by
     the "Agda.Syntax.Parser.Parser" to get the next token from the input.
