On 2016-11-06 19:15, Dmitry Gutov wrote:
> Does it? It seems to go through comint-completion-at-point here,
> which tries comint-c-a-p-replace-by-expanded-history and
> comint-filename-completion, neither of which reference pcomplete.

Putting a breakpoint in that function and running completion doesn't trigger it for me :)

I see this:

    comint-dynamic-complete-functions is a variable defined in ‘comint.el’.  Its
    value is (comint-c-a-p-replace-by-expanded-history
    shell-environment-variable-completion shell-command-completion
    shell-c-a-p-replace-by-expanded-directory pcomplete-completions-at-point
    shell-filename-completion comint-filename-completion)

pcomplete-completions-at-point comes first, and is missing the "" completion.
There may be a similar problem with comint-filename-completion, of course.

Clément.