Re: [PATCH] Add new function to test whether a key is present in a hash table.

[Stefan Monnier]

> Such a function is useful because in Emacs Lisp, 'gethash' cannot
> return whether the key is present as in Common Lisp, and using
> 'gethash' alone to test for presence is nontrivial.

We could also implement it in Elisp:

    (defun hash-table-contains-p (key table)
      (let ((x '(:hash-table-contains-p)))
        (not (eq x (gethash key table x)))))


-- Stefan