Mixin template evaluated to string can convert to string mixinexpression implicitly

[Alex_Dovhal]

"kenji hara" <k.hara.pg at gmail.com> wrote:
> My proposal is just a syntactic sugar.
> You can develop such library without it.

yes, but still stable DMD release can't handle pointers in CTFE.
And without such syntactic sugar it's ungly to write something like that
    mixin(sum!q{i : iota(N); mixin(sum!q{j : iota(M), j !=i ; 
(i+j)/(i-j) }) });
this looks much better
    sum!q{i : iota(N); sum!q{j : iota(M), j !=i ; (i+j)/(i-j)}};