eldoc-last-data

eldoc-last-data is a variable defined in `eldoc.el'.
Its value is

[nil nil nil]

• This variable is obsolete since 25.1;
  use your own instead

Documentation:
Bookkeeping; elements are as follows:
0 - contains the last symbol read from the buffer.
1 - contains the string last displayed in the echo area for variables,
or argument string for functions.
2 - `function' if function args, `variable' if variable documentation.