Bug 531 – Nested template not usable directly in alias

You can't use a nested template directly, though you can use it by declaring an intermediate alias to an instantiation of the outer template. But it should be possible to access it directly. Example: ---------------------------------- import std.stdio : writefln; template Tuple(T...) { alias T Tuple; } template Join(TList1...) { template To(TList2...) { alias Tuple!(TList1,TList2) To; } } void main() { // Error: "used as a type" alias Join!(1,2,3).To!(4,5,6) combo; // Splitting it in two is OK, though // alias Join!(1,2,3) jtmp; // alias jtmp.To!(4,5,6) combo; writefln(combo); }

Please post compiler messsages in full.

This works in dmd 1.031 and 2.015

This works in dmd 1.031 and 2.015