BUG #15783: Fail to select with a function in FROM clause plus another table

The following bug has been logged on the website:

Bug reference: 15783
Logged by: To Sites
Email address: tosites2019(at)gmail(dot)com
PostgreSQL version: 10.7
Operating system: Windows 8.1
Description:

-- FAIL
select m.nome socio, p.tipo, sum(c.valor * m.percentual / 100) valor
from contas_pagas('2019-04-01', '2019-04-30', 'R') c, medico m
inner join planoconta p on (c.cod_planoconta = p.cod)
where (m.percentual > 0)
group by m.nome, p.tipo

-- ERROR
-- SQL Error [42P01]: ERROR: invalid reference to FROM-clause entry for
table "c"
-- Hint: There is an entry for table "c", but it cannot be referenced from
this part of the query.
-- Position: 169

-- WORKS
select m.nome socio, p.tipo, sum(c.valor * m.percentual / 100) valor
from contas_pagas('2019-04-01', '2019-04-30', 'R') c
inner join planoconta p on (c.cod_planoconta = p.cod)
cross join medico m
where (m.percentual > 0)
group by m.nome, p.tipo

In other words, we need to use cross join instead of put all tables in FROM
clause, if one of these tables was a function that returns a table.