Describe the bug
I get this formatting:

let this_function_has_a_long_name plus very many arguments = "and a kind of long body"

[%%expect
  {||}]

The [%%expect {||}] extension should be all on one line, not split onto two lines.

How to Reproduce
I got this using ocamlformat built from ce9e539, using --profile=janestreet.