Rustfmt doesn't support inline function calls with a block last argument unless the last argument is an array literal or lambda. Dedicated support for arrays is obviously intended for XML-like trees where a factory takes a number of arguments and then a list of children, and the use cases for block last lambda argument don't need explanation, but what I don't get is how did no one catch on that this is a useful pattern that should perhaps be generalized? Why can't I produce the same behaviour for a function call in the last position.