Problems with implicit template instantiation: Tail Currying

[Russell Lewis]

I'm trying to write a template to perform function currying of the 
*last* argument to a delegate, and I can't get implicit instantiation to 
work with my template.  Take a look at this example code:

=======
void delegate(U) Curry    (A,U...)(void delegate(A,U) dg,A arg) {
   return delegate void(U) {};
}
void delegate(U) CurryTail(A,U...)(void delegate(U,A) dg,A arg) {
   return delegate void(U) {};
}
void foo() {
   void delegate(uint,char[],uint) dg;
   uint i;
   Curry    (dg,i);
   CurryTail(dg,i);
}
=======

The CurryTail call fails with the following errors:

foo.d(11): template foo.CurryTail(A,U...) does not match any template 
declaration
foo.d(11): template foo.CurryTail(A,U...) cannot deduce template 
function from argument types (void delegate(uint, char[], uint),uint)



So: if the Curry() call works, why doesn't the CurryTail() call?  Is 
this a bug, or some sort of design restriction?

Russ