bug#20418: 25.0.50; eldoc error: (invalid-function nil)

bug#20418: 25.0.50; eldoc error: (invalid-function nil)

[Nicolas Richard]

Recipe :

Run:
emacs -Q -f package-initialize --eval '(insert "[cl-struct-package-desc]")' -f backward-char

then hit SPC and wait a tiny bit (well under a second).

Result: an error.

Here's the lisp backtrace:

Debugger entered--Lisp error: (invalid-function nil)
  documentation(cl-struct-package-desc t)
  elisp--get-fnsym-args-string(cl-struct-package-desc 1)
  apply(elisp--get-fnsym-args-string (cl-struct-package-desc 1))
  elisp-eldoc-documentation-function()
  apply(elisp-eldoc-documentation-function nil)
  #[128 "\300\301\"\206\v\300\302\"\207" [apply elisp-eldoc-documentation-function #[128 "\301\302\300!\"\207" [eldoc-documentation-function apply default-value] 4 "\n\n(fn &rest ARGS)"] nil] 4 nil]()
  eldoc-print-current-symbol-info()
  #[0 "\b\204

bug#20418: 25.0.50; eldoc error: (invalid-function nil)

[Stefan Monnier]

> then hit SPC and wait a tiny bit (well under a second).
[...]
> Debugger entered--Lisp error: (invalid-function nil)
>   documentation(cl-struct-package-desc t)
>   elisp--get-fnsym-args-string(cl-struct-package-desc 1)

Duh!  I fixed this bug locally months ago, but somehow failed to notice
it also affects master.  Should be fixed now, thanks,


        Stefan