commit 82a5e4dc889ecbfa35374616fe9c5edfa23f4504 (HEAD, refs/remotes/origin/master)
Author: Noam Postavsky <npostavs@gmail.com>
Date:   Sat Jan 14 01:47:52 2017 -0500

    Fix free var FOO-mode-{syntax,abbrev}-table warnings
    
    * lisp/emacs-lisp/derived.el (define-derived-mode): Unconditionally
    defvar the syntax and abbrev tables so that the compiler will know that
    they are dynamically bound variables (Bug#25446).

diff --git a/lisp/emacs-lisp/derived.el b/lisp/emacs-lisp/derived.el
index 762c762457..fffe972460 100644
--- a/lisp/emacs-lisp/derived.el
+++ b/lisp/emacs-lisp/derived.el
@@ -216,6 +216,7 @@ No problems result if this variable is not bound.
 	      (purecopy ,(format "Keymap for `%s'." child))))
        ,(if declare-syntax
 	    `(progn
+               (defvar ,syntax)
 	       (unless (boundp ',syntax)
 		 (put ',syntax 'definition-name ',child)
 		 (defvar ,syntax (make-syntax-table)))
@@ -224,6 +225,7 @@ No problems result if this variable is not bound.
 		      (purecopy ,(format "Syntax table for `%s'." child))))))
        ,(if declare-abbrev
 	    `(progn
+               (defvar ,abbrev)
 	       (unless (boundp ',abbrev)
 		 (put ',abbrev 'definition-name ',child)
 		 (defvar ,abbrev

commit 9c4e3097b595c739bb29261759b9ba631431329e
Author: Philipp Stephani <phst@google.com>
Date:   Wed Jan 18 19:49:58 2017 +0100

    Check that variable lists are actually lists
    
    'let' and 'let*' document that their first argument has to be a list,
    but don't check for that; instead, they allow (and silently ignore)
    other types.  Introduce an explicit type check.
    
    * src/eval.c (Flet, FletX): Check that the variable list is indeed a
    list.
    * test/src/eval-tests.el: Add unit tests.

diff --git a/src/eval.c b/src/eval.c
index 1f8d409932..c05c8d8f8d 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -857,6 +857,7 @@ usage: (let* VARLIST BODY...)  */)
   lexenv = Vinternal_interpreter_environment;
 
   varlist = XCAR (args);
+  CHECK_LIST (varlist);
   while (CONSP (varlist))
     {
       QUIT;
@@ -917,6 +918,7 @@ usage: (let VARLIST BODY...)  */)
   USE_SAFE_ALLOCA;
 
   varlist = XCAR (args);
+  CHECK_LIST (varlist);
 
   /* Make space to hold the values to give the bound variables.  */
   elt = Flength (varlist);
diff --git a/test/src/eval-tests.el b/test/src/eval-tests.el
index a1fe8ccd7d..95655eac82 100644
--- a/test/src/eval-tests.el
+++ b/test/src/eval-tests.el
@@ -47,4 +47,14 @@ Bug#24912 and Bug#24913."
     (let ((byte-compile-debug t))
       (should-error (eval `(byte-compile (lambda ,args)) t)))))
 
+
+(dolist (form '(let let*))
+  (dolist (arg '(1 "a" [a]))
+    (eval
+     `(ert-deftest ,(intern (format "eval-tests--%s--%s" form (type-of arg))) ()
+        ,(format "Check that the first argument of `%s' cannot be a %s"
+                 form (type-of arg))
+        (should-error (,form ,arg) :type 'wrong-type-argument))
+     t)))
+
 ;;; eval-tests.el ends here