3
true
false
-Uninitialized attribute base_attr_isset_alt3::Foo::_a2 at base_attr_isset_alt3::Foo::init for Foo.
-,---- Stack trace -- - - -
-| base_attr_isset_alt3::Sys::main (alt/base_attr_isset_alt3.nit:100)
-`------------------- - - -
+Uninitialized attribute _a2 (alt/base_attr_isset_alt3.nit)