[Issue 14195] New: Ice when mangling templated function parameter extern(C++) function

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14195

          Issue ID: 14195
           Summary: Ice when mangling templated function parameter
                    extern(C++) function
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: code at benjamin-thaut.de

struct Delegate1(T) {}
struct Delegate2(T1, T2) {}

template Signature(T)
{
  alias Signature = typeof(*(T.init));
}

alias del1_t = Delegate1!(Signature!(void function()));
alias del2_t = Delegate2!(Signature!(int function(float, double)),
Signature!(int function(float, double)));

extern(C++) 
{
  void DelegateTest1(del1_t);
  void DelegateTest2(del2_t);
}

When compiling with the latest dmd from git head on windows this will output:
Error: ICE: Unsupported type void()
Error: ICE: Unsupported type int(float, double)
Error: ICE: Unsupported type int(float, double)

It should mangle the functions as:
static assert(DelegateTest1.mangleof ==
"?DelegateTest1@@YAXU?$Delegate1@$$A6AXXZ@@@Z");
static assert(DelegateTest2.mangleof ==
"?DelegateTest2@@YAXU?$Delegate2@$$A6AHMN at Z$$A6AHMN at Z@@@Z");

--