Going from string to identifier

[Jean-Louis Leroy via Digitalmars-d-learn]

Here's what I am trying to do:

mixin template MakeFun(string ID, int X)
{
  int mixin(ID)() { return X; }
}
mixin MakeFun!("one", 1); // int one() { return 1; }

Alas I get:
makefunc.d(3): Error: no identifier for declarator `int`
makefunc.d(3): Error: found `{` when expecting `;`
makefunc.d(3): Error: declaration expected, not `return`
makefunc.d(4): Error: unrecognized declaration

Is there a shorter way than building the entire function 
definition as a string mixin? As in:

mixin template MakeFun(string ID, int X)
{
  import std.format;
  mixin(format("int %s() { return %s; }", ID, X));
}

mixin MakeFun!("one", 1);