540 – Nested template member function error - "function expected before ()"

A template member function with nesting confuses the compiler. It is fine with the equivalent construct existing outside a class. It only breaks when you put it inside the class.
class Foo {
 template myCast(T) {
 T myCast(U)(U val) {
 return cast(T) val;
 }
 }
}
void main() {
 Foo foo = new Foo;
 int i = foo.myCast!(int)(1.0);
} 
-->
Error: function expected before (), not 'foo dotexp template myCast(U)'

You can also easily trigger this IFTI problem with named template mixins:
template A()
{
 static void foo(T)(T t) {}
}
struct Bar
{
 mixin A!() a;
}
void main()
{
 A!().foo(1); // works
 Bar.a.foo!(int)(1); // works
 Bar.a.foo(1); // error
}
Error: function expected before (), not 'Bar dotexp template foo(T)'

This issue is a show stopper for the Arc v.2 release, unless we find a workaround of some sort. 

Created attachment 148 [details] 
patch to DMD 0.175

Here is a patch to DMD 0.175 that fixes this issue (posted december 1st to the announce newsgroup). It is not really well tested, but illustrates that the required change is quite small.

Fixed DMD 1.018 and DMD 2.002

Added to DStress as
http://dstress.kuehne.cn/run/t/template_64_A.d
http://dstress.kuehne.cn/run/t/template_64_B.d
http://dstress.kuehne.cn/run/t/template_64_C.d