Function walk_variadic_array_element_mut 

pub fn walk_variadic_array_element_mut<'ast, 'arena, W, C>(
    walker: &mut W,
    variadic_array_element: &'ast VariadicArrayElement<'arena>,
    context: &mut C,
)
where
    W: ?Sized + MutWalker<'ast, 'arena, C>,