1
Uninitialized attribute _a2 (alt/base_attr_nullable_alt2.nit:35)
,---- Stack trace -- - -  -
| base_attr_nullable_alt2::Foo::a2 (alt/base_attr_nullable_alt2.nit:35)
| base_attr_nullable_alt2::Foo::run (alt/base_attr_nullable_alt2.nit:36)
| base_attr_nullable_alt2::Foo::init (alt/base_attr_nullable_alt2.nit:48)
| base_attr_nullable_alt2::Sys::main (alt/base_attr_nullable_alt2.nit:81)
`------------------- - -  -