[Exim] Default values in single-key lookups

Hi all,

In chapter "9.5 Default values in single-key lookups" I find the next
line

data = ${lsearch*@{$local_part@$domain}{/etc/mixed-aliases}}

As I read the text this is exactly what I need, however if it test the
router with exim -bt, I get the following errormessage

failed to expand "${lsearch{*@{$local_part@$domain}}{/etc/aliases}}":
"${lsearch" is not a known operator (or a } is missing in a variable
reference)

What am I doing wrong here?

Regards,
Christian Mol