[Exim] shadow_condition and string expansion

    Hi!

It seems that string expansion does not work correctly in
shadow_condition. I used the string:

"${if eq {${lookup {${local_part}} lsearch {/var/some/file}{yes}}}{yes}
{yes}{}}"

which expands correctly using `exim -be`, but nothing happens
when I put 'shadow_condition = "..."' in a transport definition.

What am I doing wrong? A am using Exim version 3.34.

    feri.