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check whether binder is free in eliminateEta #420

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check whether binder is free in eliminateEta #420

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3 changes: 2 additions & 1 deletion src/Language/Fixpoint/Solver/Sanitize.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ import qualified Data.HashSet as S
import qualified Data.List as L
import qualified Data.Text as T
import Data.Maybe (isNothing, mapMaybe, fromMaybe)
import Control.Monad ((>=>))
import Control.Monad ((>=>), guard)
import Text.PrettyPrint.HughesPJ

type SanitizeM a = Either E.Error a
Expand Down Expand Up @@ -127,6 +127,7 @@ eliminateEta cfg si

fapp' :: F.Expr -> Maybe (F.Expr, [F.Symbol])
fapp' (F.EApp e0 (F.EVar arg)) = do
guard (arg `notElem` F.syms e0)
(fvar, args) <- fapp' e0
splitApp (fvar, arg:args)
fapp' e = pure (e, [])
Expand Down