bin/43281: sh fails one specific alias for ls

[plmday%gmail.com@localhost]

>Number:         43281
>Category:       bin
>Synopsis:       sh fails one specific alias for ls
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 09 08:50:00 +0000 2010
>Originator:     DAI Yi
>Release:        NetBSD 5.1_RC1
>Organization:
MUST
>Environment:
QEMU
>Description:
After defining an alias `la' for `ls -a', the shell /bin/sh complains `la' not 
found when issue it on the command line.

But other aliases works fine, e.g.:

alias lc='ls -C'
alias ll='ls -l'
>How-To-Repeat:
$ alias la='ls -a'
$ la

or

# alias la='ls -A'
# la
>Fix: