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Allow IOG's contra-tracer #776

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Merged
merged 1 commit into from
Jul 17, 2025
Merged

Allow IOG's contra-tracer #776

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2 changes: 1 addition & 1 deletion lsm-tree.cabal
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Original file line number Diff line number Diff line change
Expand Up @@ -600,7 +600,7 @@ library
, bytestring ^>=0.11.4.0 || ^>=0.12.1.0
, cborg ^>=0.2.10.0
, containers ^>=0.6 || ^>=0.7
, contra-tracer ^>=0.2
, contra-tracer ^>=0.1 || ^>=0.2
, crc32c ^>=0.2.1
, deepseq ^>=1.4 || ^>=1.5
, filepath
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9 changes: 8 additions & 1 deletion src/Database/LSMTree/Internal/Unsafe.hs
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Expand Up @@ -317,12 +317,19 @@ data TableTrace =
#endif
deriving stock (Show, Eq)

contramapTraceMerge :: Monad m => Tracer m TableTrace -> Tracer m (AtLevel MergeTrace)
contramapTraceMerge :: forall m. Monad m => Tracer m TableTrace -> Tracer m (AtLevel MergeTrace)
#if MIN_VERSION_contra_tracer(0,2,0)
#ifdef DEBUG_TRACES
contramapTraceMerge t = TraceMerge `contramap` t
#else
contramapTraceMerge t = traceMaybe (const Nothing) t
#endif
#else
contramapTraceMerge _t = nullTracer
where
-- See #766
_unused = pure @m ()
#endif

-- | Trace messages related to cursors.
data CursorTrace =
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