bug#24777: 26.0.50; Incorrect Edebug spec for map-let

[Gemini Lasswell]

Edebug throws an error if you try to instrument a use of map-let. To
reproduce, enter the following code into *scratch* (using emacs -Q if
you like):

(require 'map)
(defun map-bug (tag map)
  (map-let ((tag a)
            ('spam b)
            bar)
      map
    (message "%s %s %s" a b bar)))

(map-bug 'foo '((foo . 0)
                (bar . 1)
                (spam . 2)))

Evaluating this code normally produces the message "0 2 1" as expected.
But position the cursor inside the definition of map-bug and use C-u C-M-x
and you will receive the error Invalid read syntax: "Expected lambda
expression".

I tried replacing map-let's debug spec with this, and it is working for me:

(debug ((&rest &or symbolp ([form symbolp])) form body))

In GNU Emacs 26.0.50.10 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 
10.11.6 (Build 15G1004))
 of 2016-10-22 built on rainbow.local
Repository revision: f577b8efec324afc80aa4308efbfa40dcce30bbf
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
next-line: End of buffer
map-bug
0 2 1
"0 2 1"
map-bug
0 2 1
"0 2 1"
0 2 1
"0 2 1"
edebug-syntax-error: Invalid read syntax: "Expected lambda expression"
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