[Issue 8850] Nested struct creation by a template

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8850



--- Comment #5 from Kenji Hara <k.hara.pg at gmail.com> 2012-11-07 04:55:54 PST ---
(In reply to comment #3)
> I think it is supposed to work, the following does work:

In Currently, I answer: No.
Even if TemplateTypeParameter gets nested struct type, a template instantiation
will not capture the enclosing scope frame of the nested struct. It is intended
behavior.

> T fun(T, alias f)(){
>     T s;
>     return s;
> }
> 
> void main() {
>     int x=2;
>     void f(){}
>     struct R { int f() { return x; } }
>     auto m = fun!(R,f)();
> }
> 
> (The reason why it works is that the alias function parameter forces local
> template instantiation.)

In this case, as you say, func!(R, f) captures main's frame pointer (In other
words, func!(R, f) will be instantiated as a _nested template_ in main).

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