Bug 6740 – Can't call variadic type argument as a template function

template test(T, Preds...) { enum bool test = Preds[0]!T; // error: semicolon expected, not '!' } Example use-case: import std.traits; template anyPredicateSatisfy(T, Preds...) { static if (Preds.length) enum bool anyPredicateSatisfy = (Preds[0]!T) || anyPredicateSatisfy!(T, Preds[1 .. $]); else enum bool anyPredicateSatisfy = false; } void main() { assert(anyPredicateSatisfy!(int, isFloatingPoint, isIntegral)); } A workaround (by Bearophile) is: template satisfies(T, alias P) { enum satisfies = P!T; } template anyPredicateSatisfy(T, Preds...) { static if (Preds.length) enum bool anyPredicateSatisfy = satisfies!(T, Preds[0]) || anyPredicateSatisfy!(T, Preds[1 .. $]); else enum bool anyPredicateSatisfy = false; }

*** This issue has been marked as a duplicate of issue 6474 ***