functions can be created with dotted name but not removed

[Michael O'Donnell]

Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i486' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-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 e521 2.6.30-2-686 #1 SMP Sat Sep 26 01:16:22 UTC 2009 i686 
GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 4.0
Patch Level: 28
Release Status: release

Description:

A bash function with a dot in its name can be created and used with no
problems but cannot be removed - the "unset" command chokes on the name.


Repeat-By:

This sequence yields the expected results:

    function f() { echo $FUNCNAME ; }
    f
    unset f

...while this sequence fails during the unset phase with the complaint
that the name is not a valid identifier:

    function f.dot() { echo $FUNCNAME ; }
    f.dot
    unset f.dot