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+Uninitialized attribute _a1 (alt/base_attr_nullable_int_alt1.nit:32)
+,---- Stack trace -- - - -
+| base_attr_nullable_int_alt1::Foo::run (alt/base_attr_nullable_int_alt1.nit:30)
+| base_attr_nullable_int_alt1::Foo::init (alt/base_attr_nullable_int_alt1.nit:42)
+| new Foo base_attr_nullable_int_alt1::Foo::init (alt/base_attr_nullable_int_alt1.nit:42)
+| base_attr_nullable_int_alt1::Sys::main (alt/base_attr_nullable_int_alt1.nit:75)
+`------------------- - - -