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-rw-r--r--compiler/simplCore/SimplCore.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/simplCore/SimplCore.hs b/compiler/simplCore/SimplCore.hs
index da27c3557f..d83ab89bd6 100644
--- a/compiler/simplCore/SimplCore.hs
+++ b/compiler/simplCore/SimplCore.hs
@@ -599,7 +599,7 @@ simplifyPgmIO pass@(CoreDoSimplify max_iterations mode)
-- Try and force thunks off the binds; significantly reduces
-- space usage, especially with -O. JRS, 000620.
| let sz = coreBindsSize binds
- , sz == sz -- Force it
+ , () <- sz `seq` () -- Force it
= do {
-- Occurrence analysis
let { -- Note [Vectorisation declarations and occurrences]