Function rustpython_vm::compiler::parser::ast::fold::fold_arg_with_default

pub fn fold_arg_with_default<U, F>(
    folder: &mut F,
    node: ArgWithDefault<U>
) -> Result<ArgWithDefault<<F as Fold<U>>::TargetU>, <F as Fold<U>>::Error>where
    F: Fold<U> + ?Sized,