unset builtin behaves differently from bash manual

[Mu Qiao]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-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
-DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
-DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin'
-DSYS_BASHRC='/etc/bash/bashrc'
-DSYS_BASH_LOGOUT='/etc/bash/bash_logout' -DNON_INTERACTIVE_LOGIN_SHELLS
-DSSH_SOURCE_BASHRC -march=core2 -O2 -pipe -mtune=generic
uname output: Linux qiaomuf-laptop 2.6.36-gentoo-r8 #2 SMP Wed May 11
16:48:09 CST 2011 x86_64 Intel(R) Core(TM)2 Duo CPU P8700 @ 2.53GHz
GenuineIntel GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.1
Patch Level: 9
Release Status: release

Description:
  We haven't checked bash-4.0 but for bash-4.1 and later, without
options, unset first tries to unset a variable, and if that fails, tries
to unset a function. However, The manual still states the old behavior.

Repeat-By:
    always

Fix:
    fix the manual

-- 
Best wishes,
Mu Qiao
Gentoo Linux Developer
GnuPG fingerprint: 92B1 B0C4 8D14 F8C4 EFA5  3ACC 30B3 0DE4 17B1 57E9

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