--- bash-4.3/parse.y	2014-05-29 14:46:09.545543384 +0200

+++ bash-4.3/parse.y	2014-05-29 14:48:40.758626213 +0200

@@ -3858,6 +3858,8 @@ xparse_dolparen (base, string, indp, fla

   save_parser_state (&ps);

   save_input_line_state (&ls);

   orig_eof_token = shell_eof_token;

+  /* avoid echoing every substitution again */

+  echo_input_at_read = 0;

   /*(*/

   parser_state |= PST_CMDSUBST|PST_EOFTOKEN;	/* allow instant ')' */ /*(*/

--- bash-4.3/subst.c	2014-05-29 16:04:35.802784549 +0200

+++ bash-4.3/subst.c	2014-05-29 16:08:25.021942676 +0200

@@ -7103,6 +7103,7 @@ param_expand (string, sindex, quoted, ex

   WORD_LIST *list;

   WORD_DESC *tdesc, *ret;

   int tflag;

+  int old_echo_input;

   zindex = *sindex;

   c = string[++zindex];

@@ -7401,6 +7402,9 @@ arithsub:

 	}

 comsub:

+      old_echo_input = echo_input_at_read;

+      /* avoid echoing every substitution again */

+      echo_input_at_read = 0;

       if (pflags & PF_NOCOMSUB)

 	/* we need zindex+1 because string[zindex] == RPAREN */

 	temp1 = substring (string, *sindex, zindex+1);

@@ -7413,6 +7417,7 @@ comsub:

 	}

       FREE (temp);

       temp = temp1;

+      echo_input_at_read = old_echo_input;

       break;

     /* Do POSIX.2d9-style arithmetic substitution.  This will probably go