forwardSYMInExpr :: String -> Expression -> Bool
forwardSYMInExpr nm (Unary op expr _) = forwardSYMInExpr nm expr
forwardSYMInExpr :: String -> Expression -> Bool
forwardSYMInExpr nm (Unary op expr _) = forwardSYMInExpr nm expr
forwardSYMInExpr nm (Unary op expr _) = forwardSYMInExpr nm expr