The trap EXIT not allways executed

[Dr. Werner Fink]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.4 
-L/home/abuild/rpmbuild/BUILD/bash-4.4/../readline-7.0
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' 
-DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -fmessage-length=0 
-grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong 
-funwind-tables -fasynchronous-unwind-tables -g  -D_GNU_SOURCE -DRECYCLES_PIDS 
-Wall -g -Wuninitialized -Wextra -Wno-switch-enum -Wno-unused-variable 
-Wno-unused-parameter -Wno-parentheses -ftree-loop-linear -pipe -DBNC382214=0 
-DIMPORT_FUNCTIONS_DEF=0 -fprofile-use
uname output: Linux noether 4.1.34-33-default #1 SMP PREEMPT Thu Oct 20 
08:03:29 UTC 2016 (fe18aba) x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-suse-linux-gnu

Bash Version: 4.4
Patch Level: 0
Release Status: release
openSUSE Bug: 1008459

Description:
The trap EXIT not allways executed, see example script

Repeat-By:
Example script
----------------------------------------------------------------
#!/bin/bash
bash -c '
_rm () { echo ATT: Execute trap function; }
trap _rm EXIT
rm -f doesnotexist
'
echo $?

bash -c '
_rm () { echo  ATT: Execute trap function; }
rm -f doesnotexist
trap _rm EXIT
'
echo $?
----------------------------------------------------------------

which results in

----------------------------------------------------------------
0
ATT: Execute trap function
0
----------------------------------------------------------------

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