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-rw-r--r--compiler/utils/FastString.lhs4
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/utils/FastString.lhs b/compiler/utils/FastString.lhs
index ac79b5b75f..f338002709 100644
--- a/compiler/utils/FastString.lhs
+++ b/compiler/utils/FastString.lhs
@@ -2,6 +2,10 @@
% (c) The University of Glasgow, 1997-2006
%
\begin{code}
+{-# OPTIONS_GHC -O -funbox-strict-fields #-}
+-- We always optimise this, otherwise performance of a non-optimised
+-- compiler is severely affected
+
{-
FastString: A compact, hash-consed, representation of character strings.
Comparison is O(1), and you can get a Unique from them.