Hi, the idea is that if -> from __future__ import assertion_introspection then -> assert foo.bar(baz) == abc.def(), msg DetailedAssertionError: {msg} foo -> <foo...> baz -> <bar ...> foo.bar() -> <...> abc -> ... abc.def() -> ... foo.bar(baz) == abc.def() -> ... it would help introspection and testing utilities -- Ronny