Uninitialized attribute _a1 in base_attr_nullable_alt3::Bar::(base_attr_nullable_alt3::Foo::run) (alt/base_attr_nullable_alt3.nit:64)
,---- Stack trace -- - -  -
| base_attr_nullable_alt3::Bar::(base_attr_nullable_alt3::Foo::run) (alt/base_attr_nullable_alt3.nit:62)
| base_attr_nullable_alt3::Bar::init (alt/base_attr_nullable_alt3.nit:69)
| base_attr_nullable_alt3::Sys::main (alt/base_attr_nullable_alt3.nit:81)
`------------------- - -  -