UDA failling to build when using delegate

[bioinfornatics via Digitalmars-d-learn]

Dear,

why this code fail to build http://dpaste.dzfl.pl/8ef3898b05d2 ?

I try to have a structure which is used to fill information from
a file.
And I use UDA to tell : to get this field you need to read from x
to y using a delegate.


thanks for your advise