not a regression as bash-2.05 / bash-3.0 also barf on this ... i imagine 
someone has already filed this, but i couldnt seem to find it in the mailing 
lists ...

foo=$( #'
echo hi)

now the neat thing is that with bash-3.1 (unlike older versions), the 
open/close parens are detected properly when typing the example code into a 

bash-3.1 $ foo=$(#"
> )
bash: bad substitution: no closing `)' in $(#"

bash-3.0 $ foo=$(#"
> )
> bash-3.0: unexpected EOF while looking for matching `"'
bash-3.0: syntax error: unexpected end of file

notice how bash-3.0 keeps wanting more input until i hit ctrl+d ... almost 
there ! :)

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