Assert 'id'  failed (alt/base_assert_alt3.nit:25)
,---- Stack trace -- - -  -
| base_assert_alt3::Object::foo (alt/base_assert_alt3.nit:19)
| base_assert_alt3::Sys::(kernel::Sys::main) (alt/base_assert_alt3.nit:32)
`------------------- - -  -