Strange Error using parameterized opAssign for a struct

[d coder]

Greetings Robert/All

Robert suggested that I put my opAssign method as:

void opAssign (T:Foo!NN,size_t NN)(T f) { }

That works. But I want to find out if it is possible to write the opAssign
template method with a conditional in the following form. This will help me
optimize code better. Kindly suggest what would come in place of .......
below.

void opAssign (T)(T f) if(is(T .......)) { }

Regards
- Puneet
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