pub fn fold_if_exists_behavior<F, T: AstInfo, T2: AstInfo>(
folder: &mut F,
node: IfExistsBehavior,
) -> IfExistsBehavior
pub fn fold_if_exists_behavior<F, T: AstInfo, T2: AstInfo>(
folder: &mut F,
node: IfExistsBehavior,
) -> IfExistsBehavior