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problems with a subshell in .profile

From: Nils
Subject: problems with a subshell in .profile
Date: Sat, 17 Oct 2009 05:35:33 -0700 (PDT)
User-agent: G2/1.0

I use a shared .profile for bash and ksh93, I have a ksh93 specific
section which I want to separate through the following construct:

if ( test -n "${.sh.version}" ) 2>/dev/null; then
    echo "ksh"

bash just hangs while it works in POSIX shell and ksh93. A bash script
with above contents also works as expected.
Why is this?

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