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-rw-r--r--compiler/deSugar/Coverage.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/deSugar/Coverage.hs b/compiler/deSugar/Coverage.hs
index 24213330ef..92002bf793 100644
--- a/compiler/deSugar/Coverage.hs
+++ b/compiler/deSugar/Coverage.hs
@@ -187,7 +187,7 @@ writeMixEntries dflags mod count entries filename
modTime <- getModificationUTCTime filename
let entries' = [ (hpcPos, box)
| (span,_,_,box) <- entries, hpcPos <- [mkHpcPos span] ]
- when (length entries' /= count) $ do
+ when (entries' `lengthIsNot` count) $ do
panic "the number of .mix entries are inconsistent"
let hashNo = mixHash filename modTime tabStop entries'
mixCreate hpc_mod_dir mod_name