Good idea.  Is the attached patch OK?  It augments 'C-x F', 'C-x 4 F'
and 'C-x 5 F' to suggest library names too.

On 21/05/2017 05:23, Richard Stallman wrote:
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> [[[ whether defending the US Constitution against all enemies,     ]]]
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>
> I think find-function is more useful to put on a key than
> find-library.  Or perhaps they can be combined.  It should not be hard
> to accept an argument and try it first as a function, then as a library.
>
> If the name is both a function and a library, the function definition
> is almost surely in that library.
>