emacs lisp syntax rfc: (cond (EXPR => (lambda (X) ...)))

[Thien-Thi Nguyen]

In Scheme, the expression:

  (cond (EXPR => (lambda (X) ...)))

provides the lambda expression parameter X with the non-false
value computed from evaluating EXPR.  However, if EXPR evaluates
to false, control falls through to the next ‘cond’ clause, as
usual.  The syntax requires the symbol ‘=>’ between EXPR and the
lambda expression, without which the non-false value is discarded
(i.e., the status quo).

What do people think of adding this to Emacs Lisp?  (I would be
grateful for pointers to any previous discussion on the matter.)