-- | Find all locally-defined free Ids or type variables in several expressions
-- returning a non-deterministic set.
exprsFreeVars :: [CoreExpr] -> VarSet
exprsFreeVars = fvVarSet . exprsFVs
exprsFreeVars :: [CoreExpr] -> VarSet
exprsFreeVars = fvVarSet . exprsFVs
exprsFreeVars = fvVarSet . exprsFVs