bug#25226: Describe compiled function values in a friendlier way

[npostavs]

Severity: wishlist
tags: patch

There was some discussion on emacs-devel [1] about the value of
eldoc-documentation-function being unreadable.  Here is a patch that
produces a more human-friendly display for compiled function values:

[1]: https://lists.gnu.org/archive/html/emacs-devel/2016-06/msg00138.html

v1-0001-Describe-compiled-function-values-in-a-friendlier.patch
Description: patch

Here's a screenshot of the result:

describe-eldoc-doc-function.png
Description: screenshot with patch applied