Re: Generic functions: Specializers like `or' or `memq'?

[Emanuel Berg]

Stefan Monnier via Users list for the GNU Emacs text editor wrote:

>> My earliest confusion began when I decided that if I could
>> find the part of the code that runs the `eql' specializer
>> (or do we call it the `eql' generalizer?) and then worked
>> back from there, I would be able to make sense of
>> everything. But I couldn't even find the bit of code that
>> looks like (eql <val> <tag>)! And still can't.
>
> Nah, that would be too easy. Instead it happens implicitly
> via a lookup in a hash-table.
>
> I suspect that the code for cl-defstruct specializer might
> be easier to understand in this respect.

What's the typical use case for this?

Except for "when it is needed" I mean ...

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