bug#24748: 26.0.50; Edebug fails to instrument subr-x-tests.el

[Gemini Lasswell]

To reproduce, from the head of the emacs source tree:
1. emacs -Q
2. C-x C-f test/lisp/emacs-lisp/subr-x-tests.el RET
3. M-x edebug-all-defs RET
4. M-x eval-buffer RET

Result: Invalid read syntax error

Edebug is complaining when it gets to this:

(if-let (z (a 1) (b 2) (c 3))
    (list a b c)
  "no")

because it can't match it with if-let's Edebug specification.

I think that the Edebug spec is correct and that this use of if-let is
incorrect and that this form ought to be moved into
subr-x-test-if-let-malformed-binding.


In GNU Emacs 26.0.50.2 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 
10.11.6 (Build 15G1004))
 of 2016-10-19 built on rainbow.local
Repository revision: 911ade134058c633ab9bec75f664d44aa1faaac3
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
Debug on Error disabled globally
You can run the command ‘toggle-debug-on-error’ with M-x t-er RET
Debug on Error disabled globally
Edebug: test@subr-x-test-if-let-single-binding-expansion
Edebug: test@subr-x-test-if-let-single-symbol-expansion
Edebug: test@subr-x-test-if-let-nil-related-expansion
Edebug: test@subr-x-test-if-let-malformed-binding
Edebug: test@subr-x-test-if-let-true
edebug-syntax-error: Invalid read syntax: "Expected one of", (&rest (symbolp 
form)), (symbolp form)
Text is read-only

Configured using:
 'configure --with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS

Important settings:
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Load-path shadows:
None found.

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Memory information:
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