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Use maybeM to evaluate identifiers.

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This commit is contained in:
Rob Rix 2018-03-30 18:41:49 -04:00
parent 0355d81065
commit fe3b9730c4
1 changed files with 1 additions and 1 deletions
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src/Data/Syntax.hs
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@ -106,7 +106,7 @@ instance Ord1 Identifier where liftCompare = genericLiftCompare
instance Show1 Identifier where liftShowsPrec = genericLiftShowsPrec
instance Evaluatable Identifier where
eval (Identifier name) = lookupWith deref name >>= maybe (throwException $ FreeVariableError name) pure
eval (Identifier name) = lookupWith deref name >>= maybeM (throwException (FreeVariableError name))
instance FreeVariables1 Identifier where
liftFreeVariables _ (Identifier x) = pure x