Re: Template declaration of std.typecons.isTuple in -X JSON file.

[realhet via Digitalmars-d-learn]

When I write:

template f(Specs...)f(T.init);
The compiler syntactically refuses it: It expects a '{', not a 
"f".

Why they use this inside a __traits(compiles, {}) in Phobos?  
Does it makes sense inside there?