Don't seq unfoldings

We generate intermediate unfoldings which are just thrown away, so
evaluating them is a waste of time.

diff --git a/compiler/basicTypes/IdInfo.lhs b/compiler/basicTypes/IdInfo.lhs
index 77f0325..9dda37e 100644 (file)
--- a/compiler/basicTypes/IdInfo.lhs
+++ b/compiler/basicTypes/IdInfo.lhs
@@ -243,7 +243,10 @@ setUnfoldingInfoLazily info uf     -- Lazy variant to avoid looking at the
 
 setUnfoldingInfo :: IdInfo -> Unfolding -> IdInfo
 setUnfoldingInfo info uf 
-  = seqUnfolding uf `seq`      -- This seq makes a BIG difference to Trac #4367
+  = -- We don't seq the unfolding, as we generate intermediate
+    -- unfoldings which are just thrown away, so evaluating them is a
+    -- waste of time.
+    -- seqUnfolding uf `seq`
     info { unfoldingInfo = uf }
 
 setArityInfo :: IdInfo -> ArityInfo -> IdInfo