Template arguments produce unidentified identifier

[Adam D. Ruppe via Digitalmars-d-learn]

Take a read of this:

http://stackoverflow.com/a/32621854/1457000

The short of it is don't mixin stringof. Instead, mixin the 
actual template itself.

The functionLinkage might need to be string, but the types should 
remain literal. So try this:

mixin("alias Func = extern("~functionLinkage!Q~") (ReturnType!Q) 
function (Erase!(Parameters!Q));");


or something like that - don't concatenate strings of those, just 
make the string itself still say ReturnType!Q etc when you mix 
in. Then the scope will be correct.