*** ../bash-4.4/subst.c	2016-08-30 16:46:38.000000000 -0400
--- subst.c	2016-09-26 10:20:19.000000000 -0400
***************
*** 5932,5935 ****
--- 5933,5937 ----
    int istring_index, istring_size, c, tflag, skip_ctlesc, skip_ctlnul;
    ssize_t bufn;
+   int nullbyte;
  
    istring = (char *)NULL;
***************
*** 5939,5942 ****
--- 5941,5946 ----
      skip_ctlesc |= *s == CTLESC, skip_ctlnul |= *s == CTLNUL;
  
+   nullbyte = 0;
+ 
    /* Read the output of the command through the pipe.  This may need to be
       changed to understand multibyte characters in the future. */
***************
*** 5957,5961 ****
  	{
  #if 1
! 	  internal_warning ("%s", _("command substitution: ignored null byte in input"));
  #endif
  	  continue;
--- 5961,5969 ----
  	{
  #if 1
! 	  if (nullbyte == 0)
! 	    {
! 	      internal_warning ("%s", _("command substitution: ignored null byte in input"));
! 	      nullbyte = 1;
! 	    }
  #endif
  	  continue;