Template constructor instantiation syntax remains unresolved

[James Blachly]

I ran in to this bug from 2013 tonight:

https://issues.dlang.org/show_bug.cgi?id=10689

Briefly, templated (and overloaded) constructor syntax is 
supported:

     this(int MAX_UNPACK = BCF_UN_ALL, T)(T *h, bcf1_t *b)
     if(is(T == VCFHeader) || is(T == bcf_hdr_t))
     {
...
     }
     this(SS)(VCFHeader *vcfhdr, string chrom, int pos, string id, 
string _ref, string alt, float qual, SS filter, )
     if (isSomeString!SS || is(SS == string[]))
     {
...
     }
     this(int MAX_UNPACK = BCF_UN_ALL)(VCFHeader *vcfhdr, string 
line)
     {
...
     }


But there is no way (?) to instantiate these with specific 
template value parameters. (Deduction works just fine)

     auto rr = new VCFRecord!BCF_UN_STR(vw.vcfhdr, "...");

for example, returns the same error it did in 2013:

Error: template instance `VCFRecord!BCF_UN_STR` VCFRecord is not 
a template declaration, it is a class



Suggestions given in past threads include templating the class, 
but in this, and other posters' examples, the constructor is 
overloaded with several ways to construct the object.  Too, I am 
not sure how templating the class would work with template value 
parameters (vice type params).

Given that templating the constructor is well-supported 
syntactically, the suggestion to use a factory function seems 
inelegant.

Thanks for listening and suggestions.
James