-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)
-| new Bar 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)
-`------------------- - - -
+Runtime error: Uninitialized attribute _a1 (alt/base_attr_nullable_alt3.nit:64)