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Add FreeVariables1 instance for []

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Timothy Clem 2017-11-27 14:41:13 -08:00
parent 73990f6c0b
commit 11ca296fc0
1 changed files with 2 additions and 0 deletions
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src/Abstract/FreeVariables.hs
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@ -26,3 +26,5 @@ instance (FreeVariables1 syntax) => FreeVariables1 (TermF syntax ann) where
instance (Apply FreeVariables1 fs) => FreeVariables1 (Union fs) where
liftFreeVariables f = apply (Proxy :: Proxy FreeVariables1) (liftFreeVariables f)
instance FreeVariables1 []