templated lambda with {} cause GC

[learnfirst1]

On Friday, 10 August 2018 at 10:38:53 UTC, Simen Kjærås wrote:
> What you should do instead is:
>     T!((t){
>             printf("test 2 name = %s\n".ptr, t.name.ptr);
>         }, "test");
>
> (note the lack of the => arrow)
>
> --
>   Simen


rikki cattermole , Paul Backus, Simen Kjærås: thanks for the 
explain, it work.


Still,  if my first example is use GC, why dmd not throw error at 
compile time, instead at link time report symbols is missing.   
Is this a bug ?