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Check for zero length in internal isSingleton #675

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Bodigrim merged 1 commit into from
Dec 16, 2025
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Check for zero length in internal isSingleton #675

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2 changes: 1 addition & 1 deletion src/Data/Text.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -634,7 +634,7 @@ infixl 5 :>
-- | /O(1)/ Tests whether a 'Text' contains exactly one character.
isSingleton :: Text -> Bool
isSingleton (Text arr off len) =
len == utf8LengthByLeader (A.unsafeIndex arr off)
len /= 0 && len == utf8LengthByLeader (A.unsafeIndex arr off)
{-# INLINE isSingleton #-}

-- | /O(n)/ Returns the number of characters in a 'Text'.
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