How do I perform an `UPDATE FROM` using Diesel?

Suppose I have three tables, a, b and c:

create table c (  id serial primary key,  can_edit_b boolean not null);create table b (  id serial primary key,  value text not null);create table a (  id serial primary key,  c_id integer not null references c(id),  b_id integer not null references b(id));

I want to update b (given an id for an instance of c) so long as that instance of c is referenced by an instance of a which also references b and c.can_edit_b is true. The SQL for what I want to do:

update bset value = "some value"from c, awhere a.b_id == b.idwhere a.c_id == <user id (inserted as a Rust i32)>where c.can_edit_b == true

I can't find the relevant method/function in Diesel's API which corresponds to an SQL from. If I try and use inner_join then the compiler tells me that inner_join is not defined for UpdateStatement.