add when instead of cryptic unless

cardano-foundation · Jun 20, 2019 · d96cab2 · d96cab2
1 parent 00bf8b6
commit d96cab2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/lib/http-bridge/src/Cardano/Wallet/HttpBridge/Transaction.hs b/lib/http-bridge/src/Cardano/Wallet/HttpBridge/Transaction.hs
@@ -32,7 +32,7 @@ import Cardano.Wallet.Primitive.Types
 import Cardano.Wallet.Transaction
     ( ErrMkStdTx (..), TransactionLayer (..) )
 import Control.Monad
-    ( forM, unless )
+    ( forM, when )
 import Data.ByteString
     ( ByteString )
 import Data.Either.Combinators
@@ -54,7 +54,7 @@ newTransactionLayer = TransactionLayer
     { mkStdTx = \keyFrom inps outs -> do
         let ins = (fmap fst inps)
         let tx = Tx ins outs
-        unless (not (any (\ (TxOut _ c) -> c == Coin 0) outs))
+        when (any (\ (TxOut _ c) -> c == Coin 0) outs)
             $ Left ErrInvalidTx
         -- Not working, maybe we need to make TransactionLayer polymorphic
         let txSigData = txId @(HttpBridge n) tx