...have a (non-nested) template accepting multiple delegate types with different but variadic parameter lists...

...auto ref` was added, when the function/delegate keyword starting forms can already handle those.

--

...trying to do is make function and delegate pointers being able to be declared in...

...of type suffixes are function pointer and delegate
types:
```d
void f(Ts...)(Ts function...

...that lack this are function pointer and delegate types that return by reference and/or...

...private List iter;

  int opApply(scope int delegate(Node* t) dg)
  {
    while(auto current = iter...

...an explicit delegate.

//////////////// test.d ////////////////
@safe:

void delegate() later;

void lazyFun(void delegate() @safe expr...

...redo the lazy function as an explicit delegate. If the behavior is correct, then the...

...this.iter = iter; }
	int opApply(scope int delegate(T* t) dg) {
		while (auto current = next...

...outside the world the GC stops, but delegate everything possible to normal GC-controlled threads.