patch 7.4.1866

Problem:    Invalid memory access when exiting with EXITFREE defined.
            (Dominique Pelle)
Solution:   Set "really_exiting" and skip error messages.

src/eval.c

@@ -25348,7 +25348,11 @@ func_unref(char_u *name)
     {
 	fp = find_func(name);
 	if (fp == NULL)
+	{
+	    /* Ignore when invoked through free_all_mem(). */
+	    if (!really_exiting)
 		EMSG2(_(e_intern2), "func_unref()");
+	}
 	else if (--fp->uf_refcount <= 0)
 	{
 	    /* Only delete it when it's not being used.  Otherwise it's done

src/misc2.c

@@ -1044,6 +1044,9 @@ free_all_mem(void)
 	return;
     entered = TRUE;
 
+    /* Set this flag to indicate some errors can be ignored. */
+    really_exiting = TRUE;
+
 # ifdef FEAT_AUTOCMD
     /* Don't want to trigger autocommands from here on. */
     block_autocmds();

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1866,
 /**/
     1865,
 /**/