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