npostavs@users.sourceforge.net writes:

> Dmitry Alexandrov <321942@gmail.com> writes:
>
>> ‘eshell/which’ in its part, that locates built-in commands (‘$ which
>> which’ for example) and elisp functions in general, looks like a dirty
>> hack [0]: it calls interactive ‘describe-function’ command and parses
>> *Help* buffer.
>
> Yeah, that's not great.  Here's a patch.

Sorry, I sent a broken version, here's the right one.