create table t (t bit)
go
create view v with schemabinding as select t, '' as l from dbo.t where t = 0 group by t
go
create unique clustered index idxv on v (t)
go
/*
Msg 10138, Level 16, State 1, Line 1
Cannot create index on view 'db.dbo.v' because its select list does not include a proper use of COUNT_BIG. Consider adding COUNT_BIG(*) to select list.
*/

drop view v
go
create view v with schemabinding as select t, '' as l, count_big(*) as c from dbo.t where t = 0 group by t
go
/*
Msg 8668, Level 16, State 0, Line 1
Cannot create the clustered index 'idxv' on view 'db.dbo.v' because the select list of the view contains an expression on result of aggregate function or grouping column. Consider removing expression on result of aggregate function or grouping column from select list.
*/

'' as l

create table [dbo].[tbl] (
[t] bit not null,
[c] as '' persisted
);
go

create or alter view [vw] with schemabinding as
select [t], [c], count_big(*) as [cnt] from [dbo].[tbl] where [t] = 0 group by [t], [c];
go

create unique clustered index [ix] on [dbo].[vw] ([t], [c]);