how to get enclosing function as symbol ? (eg: __function__.stringof ==__FUNCTION__)

[Timothee Cour]

Is there any way to get the enclosing function as symbol ?

I'd like something like that:
alternative names would be:
__function__
__context__

----
auto fun(alias caller=__function__)(){
  //caller represents fun1!double
  return ReturnType!caller.init;
}

T fun1(T)(T x){
  assert(__function__.stringof==__FUNCTION__);
  alias fun=__function__;
  assert( is(ReturnType! __function__) == T);
  return fun();
}
void main(){fun1!double();}
----
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