3 ,---- Stack trace -- - - -
4 | base_attr_nullable_alt2::Foo::run (alt/base_attr_nullable_alt2.nit:36)
5 | base_attr_nullable_alt2::Foo::init (alt/base_attr_nullable_alt2.nit:48)
6 | base_attr_nullable_alt2::Sys::main (alt/base_attr_nullable_alt2.nit:81)
7 `------------------- - - -