An interrupting ^C in inter. mode doesn't restore FUNCNAME by default

[pskocik]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib  -D_FORTIFY_SOURCE=2 -g 
-O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat 
-Werror=format-security -Wall
uname output: Linux laptop 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 
09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 11
Release Status: release

Description:
    This is in reference to 
http://unix.stackexchange.com/questions/296123/sigint-is-not-cleaned-up-in-funcname?noredirect=1#comment519834_296123

    Interrupting a function with ^C in interractive mode doesn't remove the 
function
    from the function stack (FUNCNAME).

    `trap ' ' INT` fixes the problem, but it might be worth considering 
cleaning the stack by  default. (`zsh` does remove the interupted function 
chain from ${funcstack[@]}
    upon an ^C interrupt).

Repeat-By:
    a(){ echo Performing: "${FUNCNAME[@]}"; sleep 10; }
    a
    ^C