callable <Callable c> received [<Foo instance>]
<Callable c> <Foo instance> <bound method ? of <Foo instance>>
callable <Callable Foo.c()> received [<Foo instance>]
<Callable c> <Foo instance> <bound method ? of <Foo instance>> <bound method ? of <Foo instance>>
a b c
<Callable c> <Foo instance> <bound method ? of 'c'>