* lisp/loadhist.el (read-feature): Get rid of fake feature nil.

* src/minibuf.c (Ftry_completion, Fall_completions)
(Ftest_completion): Use FUNCTIONP.  (Bug#15889)

lisp/ChangeLog

+2013-11-15  Leo Liu  <sdl.web@gmail.com>
+
+	* loadhist.el (read-feature): Get rid of fake feature nil.  (Bug#15889)
+
 2013-11-14  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* progmodes/gud.el (ctl-x-map):

lisp/loadhist.el

@@ -101,14 +101,10 @@ A library name is equivalent to the file name that `load-library' would load."
   "Read feature name from the minibuffer, prompting with string PROMPT.
 If optional second arg LOADED-P is non-nil, the feature must be loaded
 from a file."
-  (intern
-   (completing-read prompt
-		    (cons nil features)
-		    (and loaded-p
-			 #'(lambda (f)
-			     (and f	; ignore nil
-				  (feature-file f))))
-		    loaded-p)))
+  (intern (completing-read prompt
+			   features
+			   (and loaded-p #'feature-file)
+			   loaded-p)))
 
 (defvaralias 'loadhist-hook-functions 'unload-feature-special-hooks)
 (defvar unload-feature-special-hooks

src/ChangeLog

+2013-11-15  Leo Liu  <sdl.web@gmail.com>
+
+	* minibuf.c (Ftry_completion, Fall_completions)
+	(Ftest_completion): Use FUNCTIONP.  (Bug#15889)
+
 2013-11-15  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* lisp.h (DEFINE_GDB_SYMBOL_BEGIN, DEFINE_GDB_SYMBOL_END):

src/minibuf.c

@@ -1199,9 +1199,7 @@ is used to further constrain the set of candidates.  */)
     type = (HASH_TABLE_P (collection) ? hash_table
 	    : VECTORP (collection) ? obarray_table
 	    : ((NILP (collection)
-		|| (CONSP (collection)
-		    && (!SYMBOLP (XCAR (collection))
-			|| NILP (XCAR (collection)))))
+		|| (CONSP (collection) && !FUNCTIONP (collection)))
 	       ? list_table : function_table));
   ptrdiff_t idx = 0, obsize = 0;
   int matchcount = 0;
@@ -1460,9 +1458,7 @@ with a space are ignored unless STRING itself starts with a space.  */)
   Lisp_Object allmatches;
   int type = HASH_TABLE_P (collection) ? 3
     : VECTORP (collection) ? 2
-    : NILP (collection) || (CONSP (collection)
-			    && (!SYMBOLP (XCAR (collection))
-				|| NILP (XCAR (collection))));
+    : NILP (collection) || (CONSP (collection) && !FUNCTIONP (collection));
   ptrdiff_t idx = 0, obsize = 0;
   ptrdiff_t bindcount = -1;
   Lisp_Object bucket, tem, zero;
@@ -1691,9 +1687,7 @@ the values STRING, PREDICATE and `lambda'.  */)
 
   CHECK_STRING (string);
 
-  if ((CONSP (collection)
-       && (!SYMBOLP (XCAR (collection)) || NILP (XCAR (collection))))
-      || NILP (collection))
+  if (NILP (collection) || (CONSP (collection) && !FUNCTIONP (collection)))
     {
       tem = Fassoc_string (string, collection, completion_ignore_case ? Qt : Qnil);
       if (NILP (tem))