I often use M-: (eval-expression) to check or set variable values or as a calculator. But if I try to use completion there, I always end up with the *Completions* buffer. Is there any nice completion replacement package which deals with this use case? I think it’s a matter of supporting completion-at-point inside the minibuffer.

So far, I found that:

• company-mode is not supported in the minibuffer.
• Helm does have some support for this, but it’s a little wonky. Something about the way it handles spaces makes it unintuitive in this use case.