Strange Error using parameterized opAssign for a struct

[d coder]

>
>
> 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 .......)) { }
>


void opAssign (T)(T f) if(is(T L : Foo!(NN,MM), int NN, int MM)) { }

I found that the above declaration compiles. But again it compiles with int
as parameter type. Fails for size_t.

Any other idea?

Regards
- Puneet
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