[erlang-questions] cover & export_all

[Yuri Lukyanov]

It seems that there is no way to cover-compile modules with export_all.
Here is a simple example:

cover_test.erl:

-module(cover_test).
test() -> ok.


$ erl
Erlang R15B01 (erts-5.9.1) [source] [64-bit] [smp:4:4]
[async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.9.1  (abort with ^G)
1> c(cover_test, [debug_info,export_all]).
{ok,cover_test}
2> cover_test:test().
ok
3> cover:compile_beam(cover_test).
{ok,cover_test}
4> cover_test:test().
** exception error: undefined function cover_test:test/0
5>


Could someone explain why it is like this? Is it done on purpose?
Maybe it's a bug?
The reason I want modules to be cover-compiled with +export_all is
that it is sometimes convinient to have unit tests outside of a
module. Before unit tests are run the modules get compiled with
+export_all for tests to be able to access private functions. But the
situation is that it is not possibe in this case to enable coverage
analysys.