Problem with overridden functions and BASH_SOURCE Array

[dethrophes]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2 -Wall
uname output: Linux modt005 2.6.38-13-generic #52-Ubuntu SMP Tue Nov 8 16:48:07 
UTC 2011 i686 i686 i386 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.2
Patch Level: 8
Release Status: release

Description:
        Problem with overridden functions having wrong source file name in 
BASH_SOURCE Array
        see example in Repeat-By section

Repeat-By:
  sourced_file.sh
                function test_function {
                        echo 1
                        echo "${BASH_SOURCE[0]}(${BASH_LINENO[0])${FUNCNAME[0]}"
                }

        main1.sh 
                source sourced_file.sh
                function test_function {
                        echo 2
                        echo "${BASH_SOURCE[0]}(${BASH_LINENO[0])${FUNCNAME[0]}"
                }
                test_function
        main2.sh 
                if true; then
                        source sourced_file.sh
                        function test_function {
                                echo 2
                                echo 
"${BASH_SOURCE[0]}(${BASH_LINENO[0])${FUNCNAME[0]}"
                        }
                        test_function
        fi

        running main1.sh you get as expected 
                2
                main.sh(4)test_function
        
        running main2.sh you get unexpectedly 
                2
                sourced_file.sh(4)test_function