function name bug ?

["christophe malvasio" <geocalc.maude@xxxxxxxxx>]

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-unknown-linux-gnu'
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux xyz 2.6.26-paldo4-x86_64 #1 SMP PREEMPT Sun Jul 27
21:05:14 CEST 2008 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 3.2
Patch Level: 33
Release Status: release

Description:
 cbz (){ echo "why 'cbz' not a valid function name ?";}
bash: syntax error near unexpected token `('
abz,caz and cba work
thanks