pub fn walk_flat_map_where_predicate<V: MutVisitor>(
vis: &mut V,
value: WherePredicate,
) -> SmallVec<[WherePredicate; 1]>
pub fn walk_flat_map_where_predicate<V: MutVisitor>(
vis: &mut V,
value: WherePredicate,
) -> SmallVec<[WherePredicate; 1]>