Prompt
======
There is a format/2 function in inspect/algebra.ex that
calls format/3 recursively that returns a list of binaries.
Instead of doing so, I want you to pass a binary as accumulator,
<<>>, and then instead of `[head | format(...)]`, on every
operation you will do `format(<<acc::binary, result::binary>>, ...)`.
Notes
=====
The assistant was able to detect an issue with `collapse/4`
but it was unable to fix it. That and the changes to
mix/tasks/format.ex were addressed manually.
José Valim
b1053b75c5