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better error message on invalid portnumber

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This commit is contained in:
Gregor Kleen 2018-10-02 18:17:48 +02:00
parent 68ddceb5f1
commit 35c653160a
1 changed files with 1 additions and 1 deletions
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src/Settings.hs
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@ -193,7 +193,7 @@ deriveFromJSON
instance FromJSON HaskellNet.PortNumber where
parseJSON = withScientific "PortNumber" $ \sciNum -> case toBoundedInteger sciNum of
Just int -> return $ fromIntegral (int :: Word16)
Nothing -> fail "Expected whole number to denote port"
Nothing -> fail "Expected whole number of plausible size to denote port"
deriveFromJSON
defaultOptions